fix: derive TokenID.equals from TokenID.Compare

[Dosik13]

Description:

Fix TokenAirdropTransaction matching tokens with a comparison that ignored the token
number, so an airdrop carrying more than one token could attribute one token's transfers to
another. TransferTransaction was unaffected — it already compares full token IDs.

• Derive TokenID.equals from TokenID.Compare so the two cannot disagree
• Add multi-token unit coverage for each of the six builder loops that match on token ID
• Add a multi-token airdrop integration test asserting on the transaction record
• Move the shared token-transfer amount helper into utilities_for_test.go

Related issue(s):

Fixes #1805
Notes for reviewer:

Checklist

• Documented (Code comments, README, etc.)
• Tested (unit, integration, etc.)

[lfdt-bot]

✅ Snyk checks have passed. No issues have been found so far.

Status	Scan Engine	Critical	High	Medium	Low	Total (0)
✅	Open Source Security	0	0	0	0	0 issues

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

Files with missing lines	Coverage Δ
sdk/token_id.go	80.70% <100.00%> (+80.70%)	⬆️

... and 203 files with indirect coverage changes

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