Allow for list[bool] and similar (list of flags).

[BrianPugh]

Fixes a bug discovered in #249.

Basically, use should be able to specify list[bool], tuple[bool, ...], Sequence[bool], or Iterable[bool] and be able to accept the flag multiple times. Consider the example:

from cyclopts import App

app = App()

@app.default
def main(
    *,
    verbose: tuple[bool, ...] = (),
):
    verbosity = sum(verbose)
    print(f"{verbosity=}")

if __name__ == "__main__":
    app()

Previously, this would raise an exception at runtime. Now, it handles repeated flags fine:

$ python repeated-flag-demo.py
verbosity=0

$ python repeated-flag-demo.py --verbose
verbosity=1

$ python repeated-flag-demo.py --verbose --verbose
verbosity=2

[codecov]

Codecov Report

Attention: Patch coverage is 88.00000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 94.02%. Comparing base (a562380) to head (a16ba52).
Report is 12 commits behind head on main.

Files with missing lines	Patch %	Lines
cyclopts/_convert.py	25.00%	1 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #251      +/-   ##
==========================================
- Coverage   94.06%   94.02%   -0.05%     
==========================================
  Files          26       26              
  Lines        2949     2961      +12     
  Branches      621      627       +6     
==========================================
+ Hits         2774     2784      +10     
- Misses         84       85       +1     
- Partials       91       92       +1     

Flag	Coverage Δ
unittests	94.02% <88.00%> (-0.05%)	⬇️

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