Use the same property name for the query term in search requests

[MatteoPologruto]

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• Tests for the changes have been added (for bug fixes / features)
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What kind of change does this PR introduce?

gRPC enhancement

What is the current behavior?

Search requests use different properties for the query term:

message LibrarySearchRequest { // The search query. string query = 2; } 

message PlatformSearchRequest { // Keywords for the search. string search_args = 2; } 

message BoardSearchRequest { // The search query to filter the board list by. string search_args = 2; } 

What is the new behavior?

The query property in LibSearchRequest has been deprecated. search_args should be used in its place.

Does this PR introduce a breaking change, and is titled accordingly?

No

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.06⚠️

Comparison is base (5725c02) 62.98% compared to head (6360f1e) 62.93%.

Additional details and impacted files

@@ Coverage Diff @@## master #2214 +/- ## ========================================== - Coverage 62.98% 62.93% -0.06%  ========================================== Files 218 218 Lines 19466 19469 +3 ========================================== - Hits 12261 12252 -9 - Misses 6122 6131 +9 - Partials 1083 1086 +3 

Flag	Coverage Δ
unit	62.93% <100.00%> (-0.06%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
commands/lib/search.go	96.66% <100.00%> (+0.11%)	⬆️
internal/cli/arguments/completion.go	87.67% <100.00%> (ø)
internal/cli/lib/args.go	84.21% <100.00%> (ø)
internal/cli/lib/search.go	60.80% <100.00%> (ø)

... and 1 file with indirect coverage changes

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