Bugfix basis properties

[BalzaniEdoardo]

Added tests to check setters for basis properties. Properties that can be set (using the set_parames) are those one that may be used in cross-validation. In particular, the following parameters should be settable

Shared by all basis:

1. n_basis_funcs
2. window_size (only in "conv" mode)
3. bounds (only in "eval" mode)

SplineBasis:

1. order

RaisedCosine:

1. width

RaisedCosineLog:

1. time_scaling
2. enforce_decay_to_zero

OrthExponentialBasis:

1. decay_rates

The mode parameter will be read-only, since most commonly, only one mode of operation will make sense for a specific variable (spike counts input will require mode="conv" for example); It will still be possible to cross-validate over different mode of operation by directly cross-validating different basis,

# define a pipeline
pipeline = Pipeline(
    [
        (
            "transformerbasis",
            nmo.basis.TransformerBasis(nmo.basis.RaisedCosineBasisLinear(6)),
        ),
        (
            "glm",
            nmo.glm.GLM(regularizer_strength=0.5, regularizer="Ridge"),
        ),
    ]
)


# define a parameter grid with the basis in the two mode of operation
param_grid = dict(
    transformerbasis___basis=(
        nmo.basis.RaisedCosineBasisLinear(5, mode="conv"),
        nmo.basis.RaisedCosineBasisLinear(5, mode="eval")),
    ),
)

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 94.23077% with 3 lines in your changes missing coverage. Please review.

Project coverage is 97.29%. Comparing base (6dcd891) to head (31de724).
Report is 126 commits behind head on main.

Files with missing lines	Patch %	Lines
src/nemos/basis.py	94.11%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #241      +/-   ##
==========================================
+ Coverage   97.24%   97.29%   +0.05%     
==========================================
  Files          20       20              
  Lines        1815     1849      +34     
==========================================
+ Hits         1765     1799      +34     
  Misses         50       50              

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