Deprecate (but do not remove) the Slurm functionality in this package (and point users to SlurmClusterManager.jl instead)

[DilumAluthge]

Depends on:

• README: Don't mention the Slurm functionality in this package (and point users to SlurmClusterManager.jl instead) #245

---

We'll first release a non-breaking release of ClusterManagers.jl with the deprecation warning.

Then, we'll follow-up with a breaking release of ClusterManagers.jl that fully removes the Slurm functionality from this package.

The README (of this package) will point users to the SlurmClusterManager.jl package instead.

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.

Project coverage is 37.85%. Comparing base (84ef921) to head (b35ad48).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/slurm.jl	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #246      +/-   ##
==========================================
+ Coverage   37.62%   37.85%   +0.22%     
==========================================
  Files           7        7              
  Lines         388      391       +3     
==========================================
+ Hits          146      148       +2     
- Misses        242      243       +1     

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[DilumAluthge]

@kleinhenz What are your thoughts on moving forward with this?

[DilumAluthge]

Bump @kleinhenz - Shall we move forward with merging this PR and making a new release of ClusterManagers.jl?

[kleinhenz]

That makes sense to me