Add Common layers

[avik-pal]

Similar to the ones in TorchVision

• [x] MLP
• [x] ConvNormAct

Previously used to be in DiffEqFlux

• [ ] SplineLayer
  • [ ] Tests
• [x] TensorProductLayer
  • [x] Tests
• [x] HamiltonianNN

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 88.72180% with 15 lines in your changes missing coverage. Please review.

Project coverage is 89.59%. Comparing base (e8ab38f) to head (fb6766c).

Files	Patch %	Lines
src/layers/tensor_product.jl	46.15%	7 Missing :warning:
src/basis.jl	95.45%	2 Missing :warning:
src/layers/conv_norm_act.jl	88.23%	2 Missing :warning:
src/layers/hamiltonian.jl	92.00%	2 Missing :warning:
ext/BoltzForwardDiffExt.jl	80.00%	1 Missing :warning:
src/layers/mlp.jl	94.44%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #33 +/- ## ========================================== - Coverage 90.85% 89.59% -1.26% ========================================== Files 15 21 +6 Lines 175 298 +123 ========================================== + Hits 159 267 +108 - Misses 16 31 +15 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.