Update grpc & http endpoint to query operations by service & spanKind

[guo0693]

Signed-off-by: Jun Guo guo0693@gmail.com

Which problem is this PR solving?

• Relates to Cassandra & memory storage update: query service to support spanKind when retrieve operations for a given service. #1921

Short description of the changes

• Update grpc & http endpoint to query operations by service & spanKind
• legacy http endpoint will stay unchanged: /services/%s/operations

[codecov]

Codecov Report

Merging #1943 into master will increase coverage by 0.02%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #1943      +/-   ##
==========================================
+ Coverage   98.43%   98.46%   +0.02%     
==========================================
  Files         198      199       +1     
  Lines        9851     9875      +24     
==========================================
+ Hits         9697     9723      +26     
+ Misses        117      116       -1     
+ Partials       37       36       -1

Impacted Files	Coverage Δ
cmd/query/app/query_parser.go	100% <ø> (ø)	⬆️
cmd/query/app/util.go	100% <100%> (ø)
cmd/query/app/querysvc/query_service.go	100% <100%> (+2.98%)	⬆️
cmd/query/app/http_handler.go	100% <100%> (ø)	⬆️
cmd/query/app/grpc_handler.go	97.61% <100%> (+0.32%)	⬆️

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