Context

This MR extends the mechanism of mempool plugins to a more general notion of protocol plugins for the shell.

It extends the plugin with a section to extend/patch the RPCs of protocols, work by @vbotbol.

It also uses this new system to provide a retrocompatible API to Edo w.r.t. the new formatting of nested pairs in Micheline, work by @rafoo_.

Finally, it changes a bit the build system to match the linking method used for protocols in the shell.

The OP's main contribution is the initial design suggestion, gitteries and opening the MR.

Manually testing the MR

Launch a sandbox node
Check the presence of the new RPC using tezos-client rpc list /chains/main/blocks/head
Try the new command (normalize data) and command line arguments (--unparsing-mode).

Edited Feb 01, 2021 by Raphaël Cauderlier