feat: Add replica events

[ieQu1]

No description provided.

[coveralls]

Coverage Report for CI Build 1068

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Coverage: 50.79%

Details

• Patch coverage: 10 uncovered changes across 2 files (11 of 21 lines covered, 52.38%).

Uncovered Changes

File	Changed	Covered	%
src/mria_rlog_replica.erl	15	9	60.0%
src/mria.erl	4	0	0.0%
Total (3 files)	21	11	52.38%

Coverage Regressions

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Coverage Stats

Relevant Lines:	2404
Covered Lines:	1221
Line Coverage:	50.79%
Coverage Strength:	1656.48 hits per line

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💛 - Coveralls

[Copilot]

Pull request overview

This PR introduces a new (explicitly unstable) API for subscribing to replicant replica-state transition events per shard, and adds a CT test to validate event emission across core shutdown/restart scenarios.

Changes:

• Add mria:subscribe_replica_events/2 and mria:unsubscribe_replica_events/2 API endpoints.
• Emit #mria_replica_status_update{} events from mria_rlog_replica on state transitions and add an ETS-backed subscription registry.
• Add a CT testcase t_replica_state_events/1 to verify the expected status transition sequence.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
test/mria_SUITE.erl	Adds a CT test validating replica state event sequences during bootstrap and reconnect.
src/mria.erl	Exposes public API functions to subscribe/unsubscribe to replica state events.
src/mria_rlog.erl	Initializes replica event ETS table during app startup.
src/mria_rlog_replica.erl	Implements subscription storage and broadcasts state transition events.
include/mria.hrl	Adds include-guard and defines #mria_replica_status_update{} record.

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