ci: use codecov/codecov-action to report coverage

[faustbrian]

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[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (develop@ce618cc). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             develop    #3779   +/-   ##
==========================================
  Coverage           ?   79.39%           
==========================================
  Files              ?      615           
  Lines              ?    13558           
  Branches           ?     1527           
==========================================
  Hits               ?    10764           
  Misses             ?     1600           
  Partials           ?     1194           

Impacted Files	Coverage Δ
...re-blockchain/src/state-machine/actions/stopped.ts	100.00% <0.00%> (ø)
...c/migrations/20180305200000-create-rounds-table.ts	100.00% <0.00%> (ø)
packages/core-magistrate-api/src/handlers.ts	100.00% <0.00%> (ø)
packages/core/src/commands/relay-run.ts	100.00% <0.00%> (ø)
packages/core-cli/src/components/ask-hidden.ts	100.00% <0.00%> (ø)
...rc/matchers/transactions/valid-second-signature.ts	100.00% <0.00%> (ø)
packages/core-transaction-pool/src/sender-state.ts	60.52% <0.00%> (ø)
...es/core-cli/src/actions/restart-running-process.ts	87.50% <0.00%> (ø)
...andlers/entity-subhandlers/plugin-core/register.ts	100.00% <0.00%> (ø)
...nsactions/src/handlers/bridgechain-registration.ts	83.33% <0.00%> (ø)
... and 605 more

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