Monorepo SBAT publish npm packages without posinstall problems

[mcortesi]

Expected Behavior

We are currently misusing posinstall script. It should be used to install depencies or patch them, and nothing more.

To build the monorepo, we need a build npm script.

Currently we use postinstall for:

• patch packages (ok)
• key:decrypt (not ok)
• download & generate contrat types on contractkit (not ok)
• fix rn_version (ok?)
• generate contract types on protocol (not ok)
• utils: build & prettify (not ok)

This issue should remove the 'not ok' usage, and move it to a yarn build stage.

Current Behavior

[mcortesi]

This was done already