feat(custom-esbuild): expose current builder options and target to plugins

[mattlewis92]

PR Checklist

Please check if your PR fulfills the following requirements:

• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[ ] Bugfix
[x] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Documentation content changes
[ ] Other... Please describe:

What is the current behavior?

The current build target and options are not exposed to plugins, so it's hard to share plugins between all projects in a repo or access current build options.

Issue Number: N/A

What is the new behavior?

The plugins file can expose a factory function that accepts the builder options and target and produces a set of plugins based on the current target and options, which matches the webpack builder behaviour.

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

Our use case is we want to have a single set of plugins shared between all our applications that can:

• Use the define option to set the current project name in the codebase
• Access the stylePreprocessorOptions option value so we can add an additional esbuild sass plugin to support react css modules written in scss.