chore(plugin): add dependencies list to context

[joao10lima]

As explained on the issue #124
This commit adds the projects dependencies list on the plugin context

Before:

import { hasRubyDependency } from "./dependencies.ts";

const isDependency = await hasRubyDependency(context, "rubocop");

At every import and function call, the application would go on the
dependency files(package.json, Pipfile, etc ...) and search for
the requested dependencies. This made the application very slow
in addition to harming the organization of the code with many unnecessary imports.

After:

const isDependency = await context.dependencies.includes("rubocop");

Now the dependency list is loaded before the introspection and
only need to read the necessary dependencies files once.

Resolves: #124

To test:

• Run Pipelinit on a project that uses Ruby, Python or JavaScript.
• Run the unit tests