web3-eth exporting of types from web3-core

[nivida]

Description

This PR will improve the DX for TS developers.

Fixes #3197

Type of change

• Types

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 test with success and extended the tests if necessary.
• I ran npm run build and tested the resulting file from dist folder in a browser.
• I have tested my code on the live network.

[coveralls]

Coverage remained the same at 84.347% when pulling 531dd47 on issue/3197 into 72d1da0 on 1.x.

[cgewecke]

I'm seeing the truffle e2e CI fail on tsc because it can't find Block exported from web3-eth.

$ tsc
lib/interface-adapter/types/index.d.ts:1:10 - error TS2305: Module '"../../../node_modules/web3-eth/types"' has no exported member 'Block'.
1 import { Block as EvmBlock } from "web3-eth";
           ~~~~~
Found 1 error.

It looks like it was removed in this commit.

Is there any way of restoring that as an alias in this PR?

See also #3150

[nivida]

Is there any way of restoring that as an alias in this PR?

Added the Block interface with a TODO comment to remove this type on a minor release.