GET /plugins/ returns both installed and available plugins

[valentimarco]

Description

2 new function to retrieve from registry all external plugins available and to install plugins by url.

For now the implementation of "retrieve from registry" bricks plugin page on admin!

Related to issue #300

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas

[pieroit]

Why closed? Just put the PR as a draft until you finish :)

[valentimarco]

i didn't nothing, i synced the fork. Maybe that?

[pieroit]

I see zero commits on the PR
Let me know, you can reopen this or create a new one

[valentimarco]

I see zero commits on the PR Let me know, you can reopen this or create a new one

Re open the PR

[pieroit]

Thanks @valentimarco congrats on your merged PR :D

Let's wait a little before testing this code because the responsibility of finding and caching the .zip file of plugins may rest on this repo.

Let's discuss this further with @EugenioPetulla @nicola-corbellini