Fix/handle kill shutdown for aggregates and snapshots

[devyetii]

Fixes

Closes #2211
Closes #2359

Changes

• Remove handling of provider deletion
• Add handling of provider kill/shutdown
• Fix unit tests

Need to be mentioned in CHANGELOG.md?

Tests

Tasks to complete before merging PR:

• Ensure system tests are passing. If not Run them manually to check for any regressions 📋
• Do any new system tests need added to test this change? do any existing system tests need updated? If so create a PR at 0chain/system_test
• Merge your system tests PR to master AFTER merging this PR

Associated PRs (Link as appropriate):

• blobber:
• gosdk:
• system_test:
• zboxcli:
• zwalletcli:
• Other: ...

[dabasov]

lgtm

[codecov-commenter]

Codecov Report

Merging #2367 (b0de551) into staging (eba7595) will decrease coverage by 0.01%.
The diff coverage is 95.77%.

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@@             Coverage Diff             @@
##           staging    #2367      +/-   ##
===========================================
- Coverage    28.98%   28.98%   -0.01%     
===========================================
  Files          377      377              
  Lines        63040    63039       -1     
===========================================
- Hits         18273    18269       -4     
- Misses       42617    42636      +19     
+ Partials      2150     2134      -16     

Flag	Coverage Δ
Unit-Tests	28.98% <95.77%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...n.net/smartcontract/dbs/event/blobber_aggregate.go	76.78% <85.71%> (+3.01%)	⬆️
...et/smartcontract/dbs/event/authorizer_aggregate.go	65.89% <100.00%> (+1.60%)	⬆️
...net/smartcontract/dbs/event/authorizer_snapshot.go	80.35% <100.00%> (+1.51%)	⬆️
...in.net/smartcontract/dbs/event/blobber_snapshot.go	94.00% <100.00%> (+0.52%)	⬆️
...ain.net/smartcontract/dbs/event/miner_aggregate.go	65.35% <100.00%> (+1.58%)	⬆️
...hain.net/smartcontract/dbs/event/miner_snapshot.go	79.62% <100.00%> (+1.62%)	⬆️
.../go/0chain.net/smartcontract/dbs/event/provider.go	64.70% <100.00%> (+0.70%)	⬆️
...n.net/smartcontract/dbs/event/sharder_aggregate.go	65.35% <100.00%> (+1.58%)	⬆️
...in.net/smartcontract/dbs/event/sharder_snapshot.go	79.62% <100.00%> (+1.62%)	⬆️
...net/smartcontract/dbs/event/validator_aggregate.go	64.51% <100.00%> (+1.55%)	⬆️
... and 1 more

... and 11 files with indirect coverage changes