Summary/Motivation:

Adds spell checker to CI test runs.

Changes proposed in this PR:

• Add CI setup necessary to run spell checker on PR runs

• Initial configuration file with some known file type exceptions; comments lists all other (included) file types for reference

• Open questions: 1) what file types should be included/excluded? 2) what known "misspellings" should be excepted, e.g. "IDAES"? 3) should we mandate that the pylint and docs checks wait on the spell-check and code-formatting (black), like pytest does?

• Locally, navigating to the FOQUS/ directory, installing typos and running typos --files will list all files that are checked. Running typos --config ./.github/workflows/typos.toml will run the spell check using the configuration file.

• Note: the Check Spelling test will fail for now, as we haven't actually corrected the spelling errors yet

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