Support additional workspace types

[jgwerner]

Adds support for custom workspace types:

• RStudio
• THEIA
• VSCode

Closes #114
Closes #174
Closes #175
Closes #146

[codecov]

Codecov Report

Merging #164 into main will decrease coverage by 1.12%.
The diff coverage is 60.00%.

@@            Coverage Diff             @@
##             main     #164      +/-   ##
==========================================
- Coverage   78.67%   77.54%   -1.13%     
==========================================
  Files          17       17              
  Lines        1083     1140      +57     
==========================================
+ Hits          852      884      +32     
- Misses        231      256      +25     

Impacted Files	Coverage Δ
src/illumidesk/spawners/spawners.py	48.05% <48.05%> (ø)
src/illumidesk/apis/jupyterhub_api.py	55.30% <100.00%> (ø)
src/illumidesk/authenticators/authenticator.py	92.39% <100.00%> (+0.62%)	⬆️
src/illumidesk/authenticators/constants.py	100.00% <100.00%> (ø)
src/illumidesk/grades/senders.py	71.01% <100.00%> (+0.86%)	⬆️

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[jgwerner]

Snyk has picked up on a vulnerability associated with scikit-learn (aka sklearn). The Common Vulnerabilities and Exposure identifier for this vulnerability states that the status is DISPUTED since the "joblib.load() function is documented as unsafe and it is the user's responsibility to use the function in a secure manner. Additionally, this vulnerability is associated with user notebook environments not the orchestrator."

A merge is therefore allowed.

[jgwerner]

Snyk lost track of the requirements.txt manifest that was previously in the notebooks folder which is now in the workspaces folder. Forced to passing and the will verify update upon merge.

[netoisc]

LGTM