Make indexer support single shard tracking.

[robin-near]

Allow using tracked_accounts. In that case, use a ShardTracker to filter down the chunks we should query.

Is there any tests for the indexer? 🤔

[codecov]

Codecov Report

Attention: Patch coverage is 6.66667% with 28 lines in your changes missing coverage. Please review.

Project coverage is 70.48%. Comparing base (beb00f4) to head (266088a).
Report is 14 commits behind head on master.

Files with missing lines	Patch %	Lines
chain/indexer/src/streamer/mod.rs	0.00%	16 Missing ⚠️
chain/indexer/src/lib.rs	0.00%	7 Missing ⚠️
chain/indexer/src/streamer/fetchers.rs	0.00%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #12607      +/-   ##
==========================================
+ Coverage   70.17%   70.48%   +0.31%     
==========================================
  Files         840      845       +5     
  Lines      169987   172001    +2014     
  Branches   169987   172001    +2014     
==========================================
+ Hits       119282   121239    +1957     
- Misses      45632    45648      +16     
- Partials     5073     5114      +41     

Flag	Coverage Δ
backward-compatibility	0.16% <0.00%> (-0.01%)	⬇️
db-migration	0.16% <0.00%> (-0.01%)	⬇️
genesis-check	1.29% <0.00%> (-0.01%)	⬇️
linux	69.41% <6.66%> (+0.01%)	⬆️
linux-nightly	70.05% <6.66%> (+0.28%)	⬆️
pytests	1.60% <0.00%> (+0.01%)	⬆️
sanity-checks	1.41% <0.00%> (+0.01%)	⬆️
unittests	70.31% <6.66%> (+0.32%)	⬆️
upgradability	0.20% <0.00%> (-0.01%)	⬇️

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[bowenwang1996]

Is there any tests for the indexer? 🤔

@khorolets do we have any?

[khorolets]

Is there any tests for the indexer? 🤔

@khorolets do we have any?

No, we don't. I have no ideas what and how to test it

[khorolets]

@robin-near I'll have a closer look at the changes and get back to you. At a glance this way of tracking shards does not make sense to the indexer and its real life use cases.

cc @frol maybe you have something in your mind.

[robin-near]

@khorolets thanks for taking a look! We need single-account tracking for the MPC (chain signatures) use case. We only care about the state of one account, and tracking all shards is a big waste of resources.