feat: plugin configuration

[CodeVoyager]

What did you implement

• bootstrap of plugins configuration. Once config is created it will be passed to the UI.
• enabled tools configuration option. Tools order from the config will be reflected on the UI.

How it can be tested

• add a config to existing plugin entry. For example

  editorjs: {
    enabled: true,
    config: {
      enabledTools: ["header", "list", "quote", "mediaLib"]
    }
  },

• only specified tools should be reflected on the UI

[cyp3rius]

@melishev do you think some of the PR's might be moved forward ? :)

[Alexnortung]

Shouldn't axios be added as a dependency (and not dev) since it is used at runtime (and should be a dependency of the parent project too)? Or am I misunderstanding something?

Btw this pull request could possibly close #67