Integrate new autograph package into catalyst

[dime10]

To remove our dependency on tensorflow, we will be releasing a standalone autograph package. This PR makes the necessary changes in Catalyst to use the new package.

Changes include:

• Substitute tensorflow imports with standalone autograph imports.
• Inherit from the existing transformer class to reuse upstream code more effectively. This means we now run all AST passes that standard AutoGraph runs.
• Eliminate the ag_utils module.
• Make diastatic-malt a hard dependency of pennylane-catalyst.

[sc-46389]
[sc-57401]

[dime10]

@josh146 From the technical side I'll consider this ready. As soon as the package is released we can move forward with the PR.

[josh146]

7c6410d seems like an easy change 🤞

[josh146]

Just a small change to enable the docs to properly build!

[codecov]

Codecov Report

Attention: Patch coverage is 92.15686% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 99.54%. Comparing base (27f6b8e) to head (f3e7d41).
Report is 3 commits behind head on main.

Files	Patch %	Lines
frontend/catalyst/autograph.py	89.18%	2 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #401      +/-   ##
==========================================
- Coverage   99.56%   99.54%   -0.03%     
==========================================
  Files          52       51       -1     
  Lines        8510     8485      -25     
  Branches      568      569       +1     
==========================================
- Hits         8473     8446      -27     
- Misses         20       21       +1     
- Partials       17       18       +1     

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