Issue/687/cosmo pub calls [version:1.16.8]

[m-aguena]

Description

Makes the cosmology have the same validate_input as the theory object.

Main changes

• Make validate_input an attibute of Modeling

Checklist

Besides passing all CI checks and coverage is at 100%, make sure you also checked the following items
(check details in CONTRIBUTING).

For developers

• Notebooks: notebooks related to this PR have been updated and all notebooks can run correctly.
• Build the documentation: All documentation builds correctly.

For reviewers

• Notebooks: notebooks related to this PR have been updated and all notebooks can run correctly.
• Build the documentation: All documentation builds correctly.

For developers (part 2)

After the PR has been approved by two reviewers:

• Update the code version in clmm/__ini__.py.
• Keep only relevant points in the squash and merge commit message.

[coveralls]

coverage: 100.0%. remained the same
when pulling 5225d29 on issue/687/cosmo_pub_calls
into 2b18cee on main.

[eduardojsbarroso]

It seems everything is good, besides the documentation line