ETH2 packages types fix

[spacesailor24]

Description

• Wraps web3-eth2-beaconchain function parameter types in an object

E.g.:

Before

getAttestationsFromPool(slot: Slot, committee_index: CommitteeIndex): Promise<Attestation[]>

After

getAttestationsFromPool(params: {slot: Slot, committee_index: CommitteeIndex}): Promise<Attestation[]>

• Move interfaces IBaseAPISchema and IBaseAPIMethodSchema to index.d.ts for web3-eth2-core
  • Removes no longer needed schema.ts
• Add ETH2Core class export to index.d.ts for web3-eth2-core
• Removes IETH2BeaconChain interface in favor of exporting a class type: ETH2BeaconChain

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• I have selected the correct base branch.
• I have performed a self-review of my own code.
• I have commented my code, particularly in hard-to-understand areas.
• I have made corresponding changes to the documentation.
• My changes generate no new warnings.
• Any dependent changes have been merged and published in downstream modules.
• I ran npm run dtslint with success and extended the tests and types if necessary.
• I ran npm run test:unit with success.
• I ran npm run test:cov and my test cases cover all the lines and branches of the added code.
• I ran npm run build and tested dist/web3.min.js in a browser.
• I have tested my code on the live network.
• I have checked the Deploy Preview and it looks correct.
• I have updated the CHANGELOG.md file in the root folder.

[coveralls]

Pull Request Test Coverage Report for Build 510127159

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 76.234%

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Totals
Change from base Build 504724575:	0.0%
Covered Lines:	3161
Relevant Lines:	3935

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💛 - Coveralls