Recurring Tasks

[lloydmeta]

Adds initial support for recurring Tasks.

Recurring Tasks are Tasks that can be defined to automatically enqueue according to a given schedule expression.

Currently, the standard Cron parser from github.com/robfig/cron is used and so it supports basic macros.

The current implementation involves having a given leader server poll for changes, and (re-using the existing leader lock mechanism) depends on mark-as-dirty and soft-deletes of RecurringTasks. The periodic poll for changed-but-unseen data and a secondary polling sync-enforcer (check against all the recurring tasks defined in the data store) ensures that changes to recurring Tasks (creates, deletes, or updates), are taken into account. The polling intervals are configurable.

Each Task enqueued from a Recurring Task also has a recurring_task_id for tracking.

At the moment, there is no support for "do not enqueue if there is a previous un-handled Task" for Recurring Tasks.

[codecov-io]

Codecov Report

Merging #4 into master will increase coverage by 4.67%.
The diff coverage is 80.03%.

@@            Coverage Diff             @@
##           master       #4      +/-   ##
==========================================
+ Coverage   72.68%   77.36%   +4.67%     
==========================================
  Files          12       18       +6     
  Lines         681     1109     +428     
==========================================
+ Hits          495      858     +363     
- Misses        144      192      +48     
- Partials       42       59      +17

Impacted Files	Coverage Δ
internal/domain/task/service.go	0% <ø> (ø)	⬆️
internal/domain/task/recurring/service.go	0% <0%> (ø)
internal/api/controllers/task/controller.go	97.45% <100%> (ø)
...a/server/routing/tasks/recurring/routes_handler.go	100% <100%> (ø)
internal/domain/task/recurring/models.go	100% <100%> (ø)
internal/domain/task/recurring/mock_service.go	35.71% <35.71%> (ø)
internal/api/models/task/models.go	94.2% <66.66%> (+12.18%)	⬆️
internal/domain/task/recurring/manager.go	76.84% <76.84%> (ø)
internal/infra/server/binding/validation/fields.go	84.61% <80%> (ø)	⬆️
...ernal/infra/server/routing/tasks/routes_handler.go	83.94% <85.18%> (ø)
... and 11 more

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