feat: support empty string for safe access operator

[w-lfchen]

Description

• Supersedes Support empty string for safe access operator Currently only an empty json string, i.e. a string in a string was supported: '""'. #629
  resolves it's changes requested here
• closes [BUG] Incorrect handling of an empty string by the safe access operator #1209

Additional Notes

This contains the breaking change of no longer supporting safe access for JSON strings, should that be mentioned in the change log or maybe even reverted?

Checklist

• I added my changes to CHANGELOG.md, if appropriate.
• The documentation in the docs/content/main directory has been adjusted to reflect my changes.
• I used cargo fmt to automatically format all code before committing

[w-lfchen]

i dropped the dependency updates, that should be done in a separate pr alongside updating to rust 1.81