feat(richtext-lexical)!: upgrade lexical from 0.13.1 to 0.14.5 and backport other changes

[AlessioGr]

Description

BREAKING:

• Lexical may introduce breaking changes in their updates. Please consult their changelog. One breaking change I noticed is that the SerializedParagraphNode now has a new, required textFormat property.

• Now that lexical supports ESM, all CJS-style imports have been changed to ESM-style imports. You may have to do the same in your codebase if you import from lexical core packages

• I have read and understand the CONTRIBUTING.md document in this repository.

Type of change

• Chore (non-breaking change which does not add functionality)
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Change to the templates directory (does not affect core functionality)
• Change to the examples directory (does not affect core functionality)
• This change requires a documentation update

Checklist:

• I have added tests that prove my fix is effective or that my feature works
• Existing test suite passes locally with my changes
• I have made corresponding changes to the documentation