CLS/chplcheck: Support editor agnostic configuration files

[jabraham17]

This PR expands the existing support for using ConfigArgParse to allow for editor-agnostic configuration files. This allows users to specify options for their project in an editor-agnostic way, and then allow CLS/chplcheck to auto-pick them up.

This also integrates nicely with Mason, allowing users to specify CLS/chplcheck options in a Mason.toml file. For example

[brick]
...

[tool.chplcheck]
disable-rule = ["UnusedLoopIndex"]

This PR also expands the options for chplcheck, allowing the following

...

[tool.chplcheck]
file = ["src/*.chpl"]
add-rules = ["lint/rules.py"]
disable-rule = ["IncorrectIndentation"]

This lets users specify all the options needed in 1 file, and then from the project root running just chplcheck does the right thing

This PR also adds the -M/--module-dir options to CLS, allowing users to add a few paths to the module search path instead of needing a full .cls-commands file. This also includes adding an internal, developer only, ability to set the root directory for standard modules.

• paratest with/without gasnet

[Reviewed by @DanilaFe]