Add Max File Size for LFS

Description

LFS files are also subject to abusing space in an instance, therefore a max file size for LFS should also be available.

Proposal

Add a max file size setting for LFS on a project and admin level.

Links / references

Documentation blurb

(Write the start of the documentation of this feature here, include:

1. Why should someone use it; what's the underlying problem.
2. What is the solution.
3. How does someone use this

During implementation, this can then be copied and used as a starter for the documentation.)