Allow SSHTunnel in job stores

[mjwen]

Summary

Allow the use of SSHTunnel in job stores. This will make it possible to use a jobflow.yaml like the below

  docs_store:
    type: MongoStore
    ssh_tunnel:
      type: SSHTunnel
      ...
  additional_stores:
    data:
      type: S3Store
        ...
      index:
        ...
      s3_profile:
        ...
      ssh_tunnel:
        type: SSHTunnel
        ...

MongoStore already have ssh tunnel support. Support for S3Store is coming from this PR materialsproject/maggma#882

The SSHTunnel class is simply added to the all_stores variable. Technically, all_stores no longer only contains stores. So, we might want to change the variable name.

[mjwen]

Test fails because SSHTunnel is relocated in this PR materialsproject/maggma#882

Once that is merged, we should be good.

[codecov]

Codecov Report

Merging #477 (e8fa70c) into main (43f8463) will increase coverage by 0.00%.
The diff coverage is 100.00%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #477   +/-   ##
=======================================
  Coverage   99.86%   99.86%           
=======================================
  Files          20       20           
  Lines        1510     1512    +2     
  Branches      416      416           
=======================================
+ Hits         1508     1510    +2     
  Misses          2        2           

Files	Coverage Δ
src/jobflow/core/store.py	100.00% <100.00%> (ø)

[utf]

Thanks!