feat: add start:with-theme and build:with-theme NPM scripts with Paragon CLI

[adamstankiewicz]

Integrates the base frontend-template-application MFE with the Paragon CLI command install-theme.

Allows engineers doing local development with custom @edx/brand NPM packages to run the custom brand without risking modifying/committing code with the custom @edx/brand package still installed.

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (13c4d6a) 0.00% compared to head (3503158) 0.00%.
Report is 10 commits behind head on master.

❗ Current head 3503158 differs from pull request most recent head ba328da. Consider uploading reports for the commit ba328da to get more accurate results

Additional details and impacted files

@@          Coverage Diff           @@
##           master    #641   +/-   ##
======================================
  Coverage    0.00%   0.00%           
======================================
  Files           2       2           
  Lines           7       7           
======================================
  Misses          7       7           

Files Changed	Coverage Δ
src/example/ExamplePage.jsx	0.00% <ø> (ø)

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[arbrandes]

Can this be made generic, somehow? Otherwise, the command would warrant being called start:with-edx-theme... and in that case, including it here would be debatable.

[adamstankiewicz]

@arbrandes Ah, yes. Let me mark this PR as a draft as it's still in flux a bit. The paragon install-theme command does now accept a --brand argument for more programmatic usage of the CLI tool (e.g., in build+deploy processes, if needed). But, we do not intend to include --brand as part of the NPM scripts in MFEs.

Instead, if the --brand argument is not passed, it prompts the user in terminal for the name/version of an NPM package to install as the @edx/brand alias instead.

We also heard some feedback recently, where a third usage pattern for this command might be a Git-ignored config file where an engineer could specify something like the following to persist the custom @edx/brand theme selection without requiring manual input each time.

// paragon-cli.config.js, gitignored
{
  'commands': {
    'install-theme': {
      'brand': '@edx/brand-edx.org@latest',
    }
}

[arbrandes]

The latter looks like a neat way out!

[PKulkoRaccoonGang]

The initial logic for starting a project with a theme was added in this pull request