refactor: replace orjson support with msgspec

[VincentRPS]

Summary

Replaces orjson with the faster msgspec library.

Should not lead to any breaking changes as it does not change any method.

Msgspec averages to be much faster then orjson in most cases:

Information

• This PR fixes an issue.
• This PR adds something new (e.g. new method or parameters).
• This PR is a breaking change (e.g. methods or parameters removed/renamed).
• This PR is not a code change (e.g. documentation, README, typehinting,
  examples, ...).

Checklist

• I have searched the open pull requests for duplicates.
• If code changes were made then they have been tested.
  • I have updated the documentation to reflect the changes.
• If type: ignore comments were used, a comment is also left explaining why.
• I have updated the changelog to include these changes.