Feature #1480: Handle rpc calls from apps SDK

[mmv08]

This PR:

• Closes Feature: Handle RPC_CALL messages from safe apps sdk #1480 by adding a handler for SDK's RPC_CALL message which passes the payload to read-only web3 provider send method

For testing you can use https://github.com/gnosis/safe-test-app, I added a tab with all the rpc calls to the app

[github-actions]

CLA Assistant Lite All Contributors have signed the CLA.

[github-actions]

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Type	Occurrences	Fixable
Errors	0	0
Warnings	0	0
Ignored	0	N/A

• Result: ✅ success
• Annotations: 0 total

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^{Report generated by eslint-plus-action}

[github-actions]

ESLint Summary View Full Report

Annotations are provided inline on the Files Changed tab. You can also see all annotations that were generated on the annotations page.

Type	Occurrences	Fixable
Errors	0	0
Warnings	0	0
Ignored	0	N/A

• Result: ✅ success
• Annotations: 0 total

---

^{Report generated by eslint-plus-action}

[ghost]

Travis automatic deployment:
https://pr1519--safereact.review.gnosisdev.com/app

[fernandomg]

out of curiosity, why won't it generate a conflict? shouldn't we make it somehow dynamic?

[mmv08]

The id is required to be defined by json rpc specification, but our callback is already mapped to a request, so I don’t think it will cause any conflict. Let’s ask @rmeissner if he could confirm it

[ghost]

Travis automatic deployment:
https://pr1519--safereact.review.gnosisdev.com/app

[ghost]

Travis automatic deployment:
https://pr1519--safereact.review.gnosisdev.com/app

[ghost]

Travis automatic deployment:
https://pr1519--safereact.review.gnosisdev.com/app