Remove usage of storageRead function on Chain actions

[2snEM6]

Expected behavior

storageRead was intended to make the non-breaking changes for network layer. Any kind of formatting you need for blocks for the APIs, should be done in API module itself. So directly use storage.entities.Block.get, and format the response how the API is required.

Action can be removed and API module can directly perform the same logic itself instead of using the channel to call this action.

Discussed here:
https://github.com/LiskHQ/lisk/pull/2982/files/4667c5aa2129a7b604f2bb45220e62d5c0bee508#r260461947

Actual behavior

storageRead is being used by Chain actions that are called by API module.

Steps to reproduce

Which version(s) does this affect? (Environment, OS, etc...)