Add support for declaring specific endpoints to be built

[con322]

Description

This PR adds the ability to define the endpoints you want to build so that if your working on a specific part of a project you can optimise performance/speed of builds for what your working on via defining the endpoints after @ symbol. For example for all projects you can use @frontend or if your working with multiple project and only want to build the frontend assets for one you can use test-plugin@frontend. Fixes #46

Change log

• Add logic so that projects positional can have entrypoints defined after them by appened @ along with the entrypoint ie test-plugin@frontend or multiple via + such as test-plugin@frontend+editor.
• Adds new property to project config called filteredEntrypoints which will contain the specified entrypoints if set, defaults to empty array.
• Add cli test.
• Add unit test for new util function (getFilteredEntryPoints).

Code reviewer(s)

• Is filteredEntrypoints the right variable name?
• Should some kind of validation be performed to ensure projects/filtered endpoints are following the correct format (plugin@fronted+editor, @frontend, etc)?
• README.md will be updated once an initial review has been done and the above questions have been answered as things are subject to change.

Testing

Example Individual Projects build command: build-tools build my-plugin@frontend.
Example Site-wide build command: build-tools build @frontend.

• Verify Individual Projects build command works without @ specified
• Verify Individual Projects build command works with single @frontend specified
• Verify Individual Projects build command works with multiple @frontend+editor specified
• Verify Site-wide build command works without @ specified
• Verify Site-wide build command works with single @frontend specified
• Verify Site-wide build command works with multiple @frontend+editor specified

[jaymcp]

Thanks Connor! Works for me 😊

[ampersarnie]

I've not tested yet and only reviewed code. Looks great, I've left some minor feedback for you. Also, can you update the docs in docs/ with how this works to provide guidance to users.

[ampersarnie]

Good to go after these are removed.

[ampersarnie]

Just spotted this, yarn isn't used in the project so can this be removed to avoid confusion.

[con322]

Removed this :)

[ampersarnie]

Just spotted this, yarn isn't used in the project so can this be removed to avoid confusion.

[con322]

Removed this :)