angle solver qsp/qsvt

[KetpuntoG]

Context:

This PR appears in the context of the QSVT project, specifically focusing on the implementation of the angle solver, functionality to calculate the angles needed to apply a polynomial transformation.

Description of the Change:

Added qml.poly_to_angles, the main functionality of the PR that takes as input a polynomial and returns the angles.
Also included is the function qml.transform_angles, which transforms the angle format between qsp and qsvt.
Both these functions and other auxiliary functions have been added in qsvt.py.

Benefits:

Calculating angles is not a simple task and existing libraries have some limitations. With this new functionality we will facilitate the use of routines such as qsp and qsvt.

Possible Drawbacks:

Currently only one solver has been introduced. In the future it is expected to add more that will work for more extreme cases: larger polynomials (degree > 1000) or degenerate polynomials

[sc-72631]

[github-actions]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.65%. Comparing base (01c7c28) to head (5546c5d).
Report is 292 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #6483   +/-   ##
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  Coverage   99.65%   99.65%           
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  Files         456      456           
  Lines       42993    43060   +67     
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+ Hits        42844    42911   +67     
  Misses        149      149           

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[soranjh]

Thanks @KetpuntoG, left my first round of comments.

[Jaybsoni]

Looks good from my side! just a few small suggestions

[soranjh]

Thanks @KetpuntoG, left a final set of comments.

[soranjh]

Last few minor comments.

[soranjh]

Please address the final points.