MPSPrep Template

[KetpuntoG]

This PR adds the MPSPrep template in qml.labs.
It is a template that serves as a container to send to tensor.lightning the mps input to prepare the state.
[sc-77844]

[github-actions]

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Please edit doc/releases/changelog-dev.md with:

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 17 lines in your changes missing coverage. Please review.

Project coverage is 99.34%. Comparing base (ade6465) to head (2f64e1d).
Report is 9 commits behind head on master.

Files with missing lines	Patch %	Lines
...abs/templates/state_preparations/state_prep_mps.py	0.00%	14 Missing ⚠️
pennylane/labs/__init__.py	0.00%	1 Missing ⚠️
pennylane/labs/templates/__init__.py	0.00%	1 Missing ⚠️
...lane/labs/templates/state_preparations/__init__.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6431      +/-   ##
==========================================
- Coverage   99.70%   99.34%   -0.36%     
==========================================
  Files         447      450       +3     
  Lines       42424    42445      +21     
==========================================
- Hits        42299    42168     -131     
- Misses        125      277     +152     

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