Allow for return type signature in @qjit methods

[erick-xanadu]

Context: Methods with return type signatures are not compiled.

Description of the Change: At the moment, ignore the return type signature as it is computed by JAX.

Benefits: More valid python code is able to be compiled.

Possible Drawbacks: It would be nice to incorporate return type signature to the warning message if the detected return type is not the same as the one specified by the user. But we can leave this to the next PR.

Related GitHub Issues: Fixes #750

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.10%. Comparing base (5d7d1fd) to head (dbbfb89).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #751   +/-   ##
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  Coverage   98.10%   98.10%           
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  Files          69       69           
  Lines        9550     9555    +5     
  Branches      746      747    +1     
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+ Hits         9369     9374    +5     
  Misses        147      147           
  Partials       34       34           

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[josh146]

Possible Drawbacks: It would be nice to incorporate return type signature to the warning message if the detected return type is not the same as the one specified by the user. But we can leave this to the next PR.

@erick-xanadu my inclination is not to do this, because Python type hinting typically has no logical effect on code execution?

But rather, leave this to a user running static type analysis tools like mypy

[erick-xanadu]

@josh146 alright! I haven't incorporated the warning nor any checking in this PR. This PR only makes it so that if a function is annotated with a return type signature, the function can still be compiled. Without this PR, we have an error when the function has a return type signature.

[dime10]

Nice catch!