Add with_bias parameter to create_mlp

[qgallouedec]

Description

It would allow to make ARSLinearPolicy a special case of ARSPolicy

Motivation and Context

• I have raised an issue to propose this change (required for new features and bug fixes)

(I didn't raise an issue as it seems not to be a big new feature)

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation (update in the documentation)

Checklist:

• I've read the CONTRIBUTION guide (required)
• I have updated the changelog accordingly (required).
• My change requires a change to the documentation.
• I have updated the tests accordingly (required for a bug fix or a new feature).
• I have updated the documentation accordingly.
• I have reformatted the code using make format (required)
• I have checked the codestyle using make check-codestyle and make lint (required)
• I have ensured make pytest and make type both pass. (required)
• I have checked that the documentation builds using make doc (required)

Note: You can run most of the checks using make commit-checks.

Note: we are using a maximum length of 127 characters per line

[araffin]

Do you think it would make sense to include layer norm and dropout in this PR? (see #1069, this is to implement REDQ/DroQ as in #1036)

or do you prefer if I do that in a separate PR?

[qgallouedec]

I would prefer to do it in a separate PR, because you would have to add tests and stuff.

[qgallouedec]

a60cd1d
Wrong message, read instead "move with_bias to the last position"