Try out caching pip

[lajohn4747]

part of #2015
Longest minimum test (3.11, windows-latest)- 17m 10s went down to 14m 41s

[gsheni]

You can use the cache to determine how to install dependencies:

Suggested change

	- name: Install dependencies
	run: |
	- name: Install SDV (cache has not changed)
	if: steps.cache-pip.outputs.cache-hit == 'true'
	run: |
	python -m pip install --no-dependencies .
	- name: Install SDV and dependencies (cache has changed)
	if: steps.cache-pip.outputs.cache-hit != 'true'
	run: |

[lajohn4747]

Cannot call the force command --no-dependencies, as that command ignores installing dependencies altogether (Job example).

Pip looks into the cache location path and will directly install those files rather than re-download them so we don't need to have separate steps. Example here: we can see it using the cache and cut down the time for windows installation by not downloading. (~2-3 mins saved)

[lajohn4747]

Appears to be minimal gain with caching and we have a limit to how much we can cache for tests. Closing without merging since the investigation results do not warrant the addition.