Add CDC text formatting APIs

[dlunch]

Summary

• Add the CDC java.text core hierarchy: Format, DateFormat, SimpleDateFormat, NumberFormat, and DecimalFormat.
• Add FieldPosition, ParsePosition, and ParseException, plus runtime class registration.
• Extend Calendar with timezone and leniency behavior needed by date formatting.
• Cover formatting, parsing, factories, patterns, cloning, and error positions with standard-library tests.

Compatibility scope

This targets practical CDC application compatibility with English/US symbols and GMT or raw-offset time zones. Localized symbol resource classes, localized patterns, scientific notation, a full timezone database, and full lenient date normalization remain out of scope.

Validation

• cargo fmt --all -- --check
• cargo clippy -p java_runtime --tests -- -D warnings
• cargo test -p java_runtime (187 passed)
• cargo test --workspace (229 passed, 1 ignored)
• git diff --check

[codecov]

Codecov Report

❌ Patch coverage is 81.44057% with 420 lines in your changes missing coverage. Please review.
✅ Project coverage is 86.50%. Comparing base (f87e410) to head (84bf15c).

Files with missing lines	Patch %	Lines
java_runtime/src/classes/java/text/date_format.rs	76.28%	125 Missing ⚠️
...untime/src/classes/java/text/simple_date_format.rs	78.11%	102 Missing ⚠️
...ava_runtime/src/classes/java/text/number_format.rs	81.33%	95 Missing ⚠️
...va_runtime/src/classes/java/text/decimal_format.rs	87.04%	61 Missing ⚠️
...va_runtime/src/classes/java/text/parse_position.rs	79.03%	13 Missing ⚠️
...va_runtime/src/classes/java/text/field_position.rs	84.00%	12 Missing ⚠️
java_runtime/src/classes/java/text/format.rs	87.64%	11 Missing ⚠️
java_runtime/src/classes/java/util/calendar.rs	96.42%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #183      +/-   ##
==========================================
- Coverage   87.09%   86.50%   -0.59%     
==========================================
  Files         199      207       +8     
  Lines       17962    20224    +2262     
==========================================
+ Hits        15644    17495    +1851     
- Misses       2318     2729     +411     

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[Copilot]

Pull request overview

This PR adds a minimal java.text formatting/parsing stack to java_runtime to improve CDC application compatibility, including core Format/DateFormat/NumberFormat hierarchies, supporting position/exception types, and the Calendar behaviors needed for date formatting.

Changes:

• Introduces java.text runtime classes: Format, DateFormat/SimpleDateFormat, NumberFormat/DecimalFormat, plus FieldPosition, ParsePosition, and ParseException.
• Registers the new runtime classes and extends java.util.Calendar with timezone + leniency behavior needed by the formatters.
• Adds standard-library tests covering factories, formatting/parsing, patterns/quoting, cloning, and error/field positions.

Reviewed changes

Copilot reviewed 17 out of 17 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
java_runtime/tests/classes/java/text/test_number_format.rs	Adds NumberFormat/DecimalFormat factory/format/parse and position tests.
java_runtime/tests/classes/java/text/test_format.rs	Adds tests for common text hierarchy, positions, ParseException, and polymorphic Format methods.
java_runtime/tests/classes/java/text/test_date_format.rs	Adds DateFormat/SimpleDateFormat formatting/parsing/timezone/clone tests.
java_runtime/tests/classes/java/text/mod.rs	Wires new java.text test modules.
java_runtime/tests/classes/java/mod.rs	Enables text tests from the Java test module root.
java_runtime/src/loader.rs	Registers new java/text/* runtime class protos.
java_runtime/src/classes/java/util/calendar.rs	Adds setTimeZone, isLenient, setLenient, and leniency participation in equals/hashCode.
java_runtime/src/classes/java/text/simple_date_format.rs	Implements pattern tokenization plus formatting/parsing for a scoped set of SimpleDateFormat tokens.
java_runtime/src/classes/java/text/parse_position.rs	Implements ParsePosition fields/accessors/equality/hash/toString.
java_runtime/src/classes/java/text/parse_exception.rs	Implements ParseException with error offset storage.
java_runtime/src/classes/java/text/number_format.rs	Implements NumberFormat factories, formatting dispatch, parsing helpers, and digit/grouping configuration.
java_runtime/src/classes/java/text/format.rs	Implements base Format behavior: format(Object), parseObject(String), and clone.
java_runtime/src/classes/java/text/field_position.rs	Implements FieldPosition fields/accessors/equality/hash/toString.
java_runtime/src/classes/java/text/decimal_format.rs	Implements DecimalFormat pattern parsing, formatting, parsing, and multiplier support.
java_runtime/src/classes/java/text/date_format.rs	Implements DateFormat factories, calendar/numberFormat plumbing, parsing/format helpers, and deep-ish clone behavior.
java_runtime/src/classes/java/text.rs	Adds the java::text module and re-exports new classes.
java_runtime/src/classes/java.rs	Exposes pub mod text from classes::java.

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