Adding batching support for symbolic operators

[albi3ro]

This PR updates the Adjoint and Pow symbolic operators to also have the new ndim_params and batch_size properties added recently in #2575. It also adds the is_hermitian property to the Adjoint symbolic operator.

This PR should fix the failing build for the tutorial_classical_kernels.py demo.

[github-actions]

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

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[codecov]

Codecov Report

Merging #2672 (b857693) into master (a4a6fda) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #2672   +/-   ##
=======================================
  Coverage   99.58%   99.58%           
=======================================
  Files         249      249           
  Lines       20185    20200   +15     
=======================================
+ Hits        20102    20117   +15     
  Misses         83       83           

Impacted Files	Coverage Δ
pennylane/ops/op_math/adjoint_class.py	100.00% <100.00%> (ø)
pennylane/ops/op_math/pow_class.py	100.00% <100.00%> (ø)

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[rmoyard]

Thanks @albi3ro for the quick change, it looks good to me 💯