Add --index option to auth.user.grant (SYN-5397)

[Cisphyx]

No description provided.

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.10 ⚠️

Comparison is base (80ed2f1) 97.30% compared to head (869aeda) 97.21%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3150      +/-   ##
==========================================
- Coverage   97.30%   97.21%   -0.10%     
==========================================
  Files         222      222              
  Lines       44337    44338       +1     
==========================================
- Hits        43143    43101      -42     
- Misses       1194     1237      +43     

Flag	Coverage Δ
linux	97.21% <100.00%> (+<0.01%)	⬆️
linux_replay	?

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Impacted Files	Coverage Δ
synapse/lib/stormlib/auth.py	100.00% <ø> (ø)
synapse/lib/cell.py	98.42% <100.00%> (ø)
synapse/lib/stormtypes.py	98.75% <100.00%> (+<0.01%)	⬆️

... and 9 files with indirect coverage changes

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