Add Web3Provider

[dawsbot]

Blocked first by #170

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For use initially to do message signing transactions. Unblocks #24

https://github.com/rkalis/revoke.cash/blob/189d6cb70f0a080994ce71f95167969eb3b82e4b/pages/index.tsx

[shivamklr]

@dawsbot Hey, I was wondering if you need any assistance with this one?

[dawsbot]

Massively. But it's not ready yet since there are several encoding + decoding types that are not yet working.

Enabling signing will be dangerous until most or all encoding/decoding types are working with essential-eth.

Perhaps we can begin towards this by supporting a few more types first in the encoder/decoder by finding complex production smart-contracts with read-only functions to test against. What do you think @shivamklr ?

[shivamklr]

We might need to create an issue for that.

[dawsbot]

We might need to create an issue for that.

Added this issue to address the situation: #170