Use pre-commit framework

[conradtchan]

Type of PR:
modification to existing code

Description:
The current pre-commit hook allows the commit to proceed, even if changes have been made. It also doesn't distinguish between staged and unstaged changes within the same file.

Use pre-commit framework to run the bots script instead of using a manual bash script. When pre-commit is enabled (completely optional), commits are blocked unless they are bot compliant.

Previously, pre-commit was installed by copying scripts/pre-commit into the git hooks directory. Now it is installed using

pre-commit install

See https://pre-commit.com

The workflow pre-commit.yml is added, which runs the bots script on push and PRs.

Testing:

• Made a change to fortran code that was not bot compliant
• Attempt commit and verify that the commit is stopped, but files were modified
• Stage new changes and attempt commit, which was successful

Did you run the bots? yes

[conradtchan]

After discussion with @danieljprice, we've concluded that running a pre-commit action is too aggressive, and may deter new developers. Therefore, bots will not be enforced with PRs, only suggested.