Make profiles query user parameter optional

[dadamu]

Description

This PR is the implementation of #534.

Closes #534

Checklist

• Targeted PR against correct branch.
• Linked to Github issue with discussion and accepted design OR link to spec that describes this work.
• Wrote unit tests.
• Wrote integration tests (simulation & CLI).
• Updated the documentation.
• Added an entry to the CHANGELOG.md file.
• Re-reviewed Files changed in the Github PR explorer.

[codecov]

Codecov Report

Merging #539 (2b4a15b) into master (3d93d51) will increase coverage by 0.03%.
The diff coverage is 96.22%.

@@            Coverage Diff             @@
##           master     #539      +/-   ##
==========================================
+ Coverage   82.81%   82.84%   +0.03%     
==========================================
  Files          91       91              
  Lines        5470     5480      +10     
==========================================
+ Hits         4530     4540      +10     
  Misses        737      737              
  Partials      203      203              

Impacted Files	Coverage Δ
x/profiles/types/query_app_links.go	0.00% <0.00%> (ø)
x/profiles/client/cli/cli_app_links.go	35.35% <100.00%> (+2.02%)	⬆️
x/profiles/client/cli/cli_chain_links.go	88.37% <100.00%> (+0.42%)	⬆️
x/profiles/client/cli/cli_dtag_requests.go	85.26% <100.00%> (+0.48%)	⬆️
x/profiles/client/cli/cli_relationships.go	80.00% <100.00%> (+0.68%)	⬆️
x/profiles/keeper/grpc_query.go	75.63% <100.00%> (-0.60%)	⬇️

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[RiccardoM]

Can you please add some tests to make sure that the different comination (0, 1 args) work properly?

[dadamu]

Unit tests added.

[leobragaz]

Looks good to me

[RiccardoM]

I think all the QueryUserXXXXX should be renamed to QueryXXXXX now since the user is optional. This applied to both *Request and *Response Proto definitions

[dadamu]

@RiccardoM I see, then, the prefix User in rpc methods of them should be removed as well.