Add FormattedValue f-strings

[amaydixit11]

Pull Request description

This PR adds a new LiteralFormattedString class for representing formatted string values (f-strings) in the AST. Instead of using the Python-specific name FormattedValue, we've chosen LiteralFormattedString to maintain consistency with our existing naming conventions for literal types.

The new class handles all the essential components of formatted strings:

• The expression to be formatted
• Optional format specifiers (e.g., .2f)
• Optional conversion flags (!s, !r, !a)

This implementation allows for proper representation of f-string expressions in our AST.

Solves #202

How to test these changes

• Run the new unit tests: pytest tests/datatypes/test_char_string.py -xvs
• Create a formatted string using the new class and visualize its AST representation

Pull Request checklists

This PR is a:

• bug-fix
• new feature
• maintenance

About this PR:

• it includes tests.
• the tests are executed on CI.
• the tests generate log file(s) (path).
• pre-commit hooks were executed locally.
• this PR requires a project documentation update.

Author's checklist:

• I have reviewed the changes and it contains no misspelling.
• The code is well commented, especially in the parts that contain more
  complexity.
• New and old tests passed locally.

[xmnlab]

@amaydixit11 please fix the issues raised in the CI

[github-actions]

This pull request has been marked as stale because it has been
inactive for more than 5 days. Please update this pull request
or it will be automatically closed in 5 days.

[xmnlab]

I am closing this PR because it was labeled as staled.
thanks @amaydixit11 , feel free to reopen it if you want to work on that again.