feat(types/collections): add LegacyDec collection value (backport #21693)

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Description

Closes: #XXXX

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Summary by CodeRabbit

• New Features
  • Introduced support for legacy decimal values, enhancing compatibility with existing data formats.
  • Added methods for encoding, decoding, and JSON handling of legacy decimal values.

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This is an automatic backport of pull request #21693 done by [Mergify](https://mergify.com).

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