add grpc support for schedules api

[guergabo]

Changes:

• grpc support for schedules api
• include headers for schedules
• fix client api issue (stuck it in there)
• re-enable test harness
• remove inline in openapi for resuability and removing anonymous structs (search queries are find since just strings and single usage)

[codecov]

Codecov Report

Attention: 492 lines in your changes are missing coverage. Please review.

Comparison is base (d550104) 66.77% compared to head (7202dfb) 64.19%.
Report is 1 commits behind head on main.

Files	Patch %	Lines
...nternal/app/subsystems/api/grpc/api/schedule.pb.go	27.59%	379 Missing and 4 partials ⚠️
...al/app/subsystems/api/grpc/api/schedule_grpc.pb.go	57.14%	33 Missing and 12 partials ⚠️
internal/app/subsystems/api/grpc/schedule.go	65.38%	28 Missing and 8 partials ⚠️
...nal/app/subsystems/api/grpc/api/promise_grpc.pb.go	72.34%	13 Missing ⚠️
internal/app/subsystems/api/http/schedule.go	33.33%	6 Missing and 2 partials ⚠️
cmd/util/util.go	0.00%	6 Missing ⚠️
cmd/promises/get.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #175      +/-   ##
==========================================
- Coverage   66.77%   64.19%   -2.58%     
==========================================
  Files          80       83       +3     
  Lines        8052     8807     +755     
==========================================
+ Hits         5377     5654     +277     
- Misses       2320     2772     +452     
- Partials      355      381      +26     

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