Fixes for Python 3.14 and PEP 649

[JelleZijlstra]

I ran the typeguard test suite on the current CPython main branch to
look for possible breakage from PEP 649 and 749, which makes large
changes to how annotations work.

I found three problems:

• DeprecationWarnings from uses of ForwardRef._evaluate, which we're
  deprecating. Made a change to use the new public API for ForwardRef.evaluate
  instead.
• A test failure that showed "annotationlib" as the module name for a forward
  ref. I made it so that it doesn't use module for ForwardRef objects.
• One remaining test failure that I haven't tracked down:
  tests/test_instrumentation.py::test_typevar_forwardref[importhook]
  It's apparently due to caching (it doesn't fail if I run only that one test),
  but I haven't tracked down the exact cause.

I also added some new tests relying on 3.14-only behavior (unquoted annotations containing forward references). Those mostly worked fine, but I had to make another tweak to how functions are wrapped.

Since the APIs in Python 3.14 may still change, I'll make this a draft
PR for now.

Checklist

If this is a user-facing code change, like a bugfix or a new feature, please ensure that
you've fulfilled the following conditions (where applicable):

• You've added tests (in tests/) added which would fail without your patch
• You've updated the documentation (in docs/, in case of behavior changes or new
  features)
• You've added a new changelog entry (in docs/versionhistory.rst).

[coveralls]

coverage: 94.299% (-0.2%) from 94.511%
when pulling 0eb5220 on JelleZijlstra:fix314
into b6a7e43 on agronholm:master.

[musicinmybrain]

Thanks for working on this! I just tested this branch with Python 3.14.0a1, and it looks like some further adjustments will be required:

========================================================================================== short test summary info ==========================================================================================
FAILED tests/test_instrumentation.py::test_typevar_forwardref[importhook] - typeguard.TypeCheckError: argument "x" (class dummymodule.DummyClass) is not a subclass of dummymodule.DummyClass
ERROR tests/test_instrumentation.py::TestUsesForwardRef::test_success[typechecked] - ModuleNotFoundError: No module named 'deferredannos'
ERROR tests/test_instrumentation.py::TestUsesForwardRef::test_failure[typechecked] - ModuleNotFoundError: No module named 'deferredannos'
ERROR tests/test_instrumentation.py::TestUsesForwardRef::test_success[importhook] - ModuleNotFoundError: No module named 'deferredannos'
ERROR tests/test_instrumentation.py::TestUsesForwardRef::test_failure[importhook] - ModuleNotFoundError: No module named 'deferredannos'
======================================================================= 1 failed, 474 passed, 4 skipped, 9 xfailed, 4 errors in 2.13s =======================================================================