improve deployment query performance

[theganyo]

• added index to deployments
• added page size to visitors
• changed registry get page size to 1k
• fixed missed filter passing in visitors where found

Fixes #1208

[codecov]

Codecov Report

Merging #1211 (d2a7b24) into main (31e01c2) will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #1211      +/-   ##
==========================================
+ Coverage   71.82%   71.84%   +0.01%     
==========================================
  Files         146      146              
  Lines       12179    12179              
==========================================
+ Hits         8748     8750       +2     
+ Misses       2750     2748       -2     
  Partials      681      681              

see 1 file with indirect coverage changes

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[theganyo]

@timburks Thanks for the review, but this is still WIP - unless you'd rather a separate PR for the page size changes we need to discuss in #1208.

[timburks]

Thanks! It might be counterintuitive to see all the zero page sizes, but I guess people will figure out that this means use the API's default limit... we're basically relying on protocol buffers code to drop zero values (and not send them) when we set limits. Just thinking out loud...