Testing framework base deployment

See also #135 @PaulDudaRESPEC

sets up 3 basic tests: current pip install, dev (python 3.10+) pip install, dev conda install
Note: neither dev installs complete testing yet (testing scripts need some help)
a couple manual tweaks to .gitignore need to be made to resolve Can't automatically merge
Note: this PR includes some changes to the environment_dev.yml from branch dependency_options https://github.com/respec/HSPsquared/blob/dependency_options/environment_dev.yml

respec / HSPsquared