[Access] Add implementation for events data providers and account statuses data providers

[AndriiDiachuk]

Closes: #6588, #6587

In this PR EventsDataProvider and AccountStatusesDataProvider were implemented.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 80.07117% with 56 lines in your changes missing coverage. Please review.

Project coverage is 41.09%. Comparing base (66e6db0) to head (f158e6f).

Files with missing lines	Patch %	Lines
.../rest/websockets/data_providers/events_provider.go	74.22%	18 Missing and 7 partials ⚠️
...ockets/data_providers/account_statuses_provider.go	77.77%	14 Missing and 6 partials ⚠️
.../rest/websockets/data_providers/blocks_provider.go	73.52%	6 Missing and 3 partials ⚠️
...e/access/rest/websockets/data_providers/factory.go	83.33%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6766      +/-   ##
==========================================
+ Coverage   41.01%   41.09%   +0.08%     
==========================================
  Files        2104     2107       +3     
  Lines      185030   185286     +256     
==========================================
+ Hits        75892    76151     +259     
+ Misses     102767   102733      -34     
- Partials     6371     6402      +31     

Flag	Coverage Δ
unittests	41.09% <80.07%> (+0.08%)	⬆️

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[peterargue]

looks good to me

[peterargue]

I think this should be outside of the check.

Suggested change

	blocksSinceLastMessage = 0
	}
	}
	blocksSinceLastMessage = 0

otherwise, it could behave strangely. for example, if heartbeatInterval is 5 and there are 4 empty blocks in a row, blocksSinceLastMessage would be 4. Then if the next block contained events, a message would be sent without resetting blocksSinceLastMessage, so on the next empty block, a heartbeat message would be sent.

looks like we have this bug in all of the places. I opened #6837 to fix this everywhere. you can skip it in this PR

[Guitarheroua]

LGTM!