Enhancement: Re-design alerts

[parmesant]

Description

Alerts used to be linked to a logstream and were based on an expression based logic With this PR, alerts will be independent of logstreams and will be based on a SQL query The given threshold config will get evaluated against the result of the query and the target config will be used to send out notifications

---

TODO:

• Unit tests
• Merge target notification task with Alerts

This PR has:

• been tested to ensure log ingestion and log query works.
• added comments explaining the "why" and the intent of the code wherever would not be obvious for an unfamiliar reader.
• added documentation for new or modified features or behaviors.

[coveralls]

Pull Request Test Coverage Report for Build 12478136650

Details

• 0 of 710 (0.0%) changed or added relevant lines in 14 files are covered.
• 7 unchanged lines in 4 files lost coverage.
• Overall coverage decreased (-1.2%) to 10.321%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/handlers/http/logstream.rs	0	1	0.0%
src/handlers/airplane.rs	0	2	0.0%
src/cli.rs	0	3	0.0%
src/rbac/role.rs	0	3	0.0%
src/query/mod.rs	0	7	0.0%
src/handlers/http/modal/query_server.rs	0	10	0.0%
src/storage/object_storage.rs	0	18	0.0%
src/handlers/http/query.rs	0	29	0.0%
src/sync.rs	0	46	0.0%
src/handlers/http/modal/server.rs	0	52	0.0%

Files with Coverage Reduction	New Missed Lines	%
src/event/mod.rs	1	0.0%
src/storage/object_storage.rs	2	0.0%
src/metadata.rs	2	1.42%
src/rbac/role.rs	2	0.0%

Totals
Change from base Build 12465451984:	-1.2%
Covered Lines:	1845
Relevant Lines:	17877

---

💛 - Coveralls