Merge balance entities and schemas

[iamacook]

Summary

Now that our migration to Zod is complete, a lot of entities are one-liners that infer their types from schemas. Towards the end of migration, we started to combile entities and their relative schemas in the same file. This does the same with the balance-related entities.

Changes

• Combine and balance.schema.ts and balance.entity.ts
• Move BalanceTokenSchema and tests to balance.token.entity/balance.token.entity.spec.ts
• Update associated imports, builders and tests

[coveralls]

Pull Request Test Coverage Report for Build 8875082894

Details

• 9 of 9 (100.0%) changed or added relevant lines in 4 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage decreased (-1.0%) to 91.878%

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Files with Coverage Reduction	New Missed Lines	%
src/routes/transactions/entities/tests/human-description.builder.ts	1	80.0%

Totals
Change from base Build 8850717076:	-1.0%
Covered Lines:	6896
Relevant Lines:	7241

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💛 - Coveralls