refactor(eos): migrate from eosjs-ecc to elliptic

[faustbrian]

Resolves #532

[codecov]

Codecov Report

Merging #535 into master will increase coverage by 9.99%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #535      +/-   ##
==========================================
+ Coverage   69.23%   79.23%   +9.99%     
==========================================
  Files          58       40      -18     
  Lines        1180     1016     -164     
  Branches       85       80       -5     
==========================================
- Hits          817      805      -12     
+ Misses        331      179     -152     
  Partials       32       32              

Flag	Coverage Δ
#unit	79.23% <100.00%> (+9.99%)	⬆️

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Impacted Files	Coverage Δ
packages/platform-sdk-eos/src/crypto.ts	100.00% <100.00%> (ø)
...ckages/platform-sdk/src/coins/collections/index.ts
...platform-sdk/src/coins/collections/transactions.ts
packages/platform-sdk/src/data/index.ts
packages/platform-sdk/src/coins/coin-factory.ts
...s/platform-sdk-btc/src/utils/unspent-aggregator.ts
packages/platform-sdk/src/coins/index.ts
packages/platform-sdk/src/coins/guard.ts
packages/platform-sdk/src/data/currencies.ts
packages/platform-sdk/src/contracts/coins/index.ts
... and 11 more

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