Add poll plugin

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 45.45220% with 2111 lines in your changes missing coverage. Please review.

Project coverage is 55.80%. Comparing base (85cf02d) to head (3b82b2b).

Files with missing lines	Patch %	Lines
internal/app/subsystems/api/grpc/pb/promise.pb.go	30.24%	545 Missing and 4 partials :warning:
internal/app/subsystems/api/grpc/pb/schedule.pb.go	35.19%	230 Missing and 2 partials :warning:
internal/app/subsystems/api/grpc/pb/task.pb.go	34.12%	220 Missing and 2 partials :warning:
internal/app/plugins/poll/poll.go	0.00%	190 Missing :warning:
internal/app/subsystems/api/grpc/pb/lock.pb.go	38.58%	154 Missing and 2 partials :warning:
...ternal/app/subsystems/api/grpc/pb/callback_t.pb.go	21.79%	118 Missing and 4 partials :warning:
...nternal/app/subsystems/api/grpc/pb/promise_t.pb.go	26.17%	109 Missing and 1 partial :warning:
...ternal/app/subsystems/api/grpc/pb/schedule_t.pb.go	29.24%	74 Missing and 1 partial :warning:
internal/app/subsystems/api/grpc/pb/callback.pb.go	40.00%	70 Missing and 2 partials :warning:
cmd/config/config.go	0.00%	48 Missing :warning:
... and 31 more

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #425 +/- ## ========================================== - Coverage 55.96% 55.80% -0.17% ========================================== Files 119 115 -4 Lines 10919 11557 +638 ========================================== + Hits 6111 6449 +338 - Misses 4383 4653 +270 - Partials 425 455 +30 ```

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