Use Pydantic V2

[ryanking13]

Bump pydantic version to v2. I tried to update the pydantic version following the migration guide, but after migration, the tests started to blow up.

So this PR updates the pydantic version but replaces all import pydantic to import pydantic.v1 so everything works as before.

[ryanking13]

FAILED tests/test_build_ts/test_build_ts.py::TestTextBuilder::test_example - AssertionError: assert 'exampleFunct...hing python\n' == 'exampleFunct...hing python\n'
  
  Skipping 60 identical leading characters in diff, use -v to show
  -   Example: This is another example.
  +   Example:
    
          Something python

It looks like this test is failing in the main branch, too...

[ryanking13]

Pinning typedoc version to 0.25.0 (latest version is 0.25.13) seems to work.

[hoodmane]

I fixed the test failures #114

[ryanking13]

I fixed the test failures #114

Great, thanks! Reverted pinning typedoc version.