[IGNITE-19093] Create standalone MetaStorage implementation for test purposes

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 3.0.0-beta2
• Labels: ignite-3
• Ignite Flags: Docs Required, Release Notes Required
• Assignee: Andrey Mashenkov
• Reporter: Andrey Mashenkov
• Created: 22/Mar/23 10:13
• Updated: 23/Mar/23 15:47
• Resolved: 23/Mar/23 15:47

Description

Motivation.
Some components depends on MetaStorage API and doesn’t tested well.
In tests, we either have to create "100500" mocks, which doesn’t implement any quasi-real behaviour (e.g. we skip serialization step), or have to implement end-to-end test and start-up real nodes.

See DistributionZoneManagerConfigurationChangesTest
Here, initialization of all the mocks looks longer than the tests themselves.
And we copy-paste this boilerplate code everywhere, when we need a bit more than stupid stub.

Suggestion
Let's

• create standalone version of MetaStorage for test purposes, which will just push raft command directly to a metastorage listener.
• replace boilerplate code in tests with new metastorage implementation.

Issue Links

• causes: IGNITE-19114 Improve tests code with using StandaloneMetastorageManager.
• links to: GitHub Pull Request #1832