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

[mergify]

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).

[mergify]

Cherry-pick of 3bc707a has failed:

On branch mergify/bp/release/v0.50.x/pr-21693
Your branch is up to date with 'origin/release/v0.50.x'.

You are currently cherry-picking commit 3bc707a5a.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   types/collections.go

no changes added to commit (use "git add" and/or "git commit -a")

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

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[julienrbrt]

Bot is right, we must fix the conflicts and add a changelog entry

[johnletey]

@julienrbrt Could I help with this?

[julienrbrt]

@julienrbrt Could I help with this?

Yes, not immediately though 😀

[julienrbrt]

lgtm! thanks @sontrinh16