Rewrite Module Packaging Logic

[samchungy]

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Hello! I'm back for business.

1. The current logic with packaging modules is very complicated. I would know as I wrote most of it 😪 Having looked through some of the CDK esbuild logic I like what they've done and instead of trying to determine what modules to package based on npm ls or yarn list they instead simply create a fake package.json and run the equivalent install command. This should make supporting newer and future bundlers simpler.

2. I would like to add per function external and exclude logic. I think excluding deps because we can't detect them being used in a function is error prone so we should instead encourage users to use per function excludes if they choose to package individually.

3. Add support for pnpm.

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[floydspace]

I'd also like to improve lifecycle hooks, add new hooks like before/after bundle, before/after package, etc.

for ref: https://github.com/floydspace/serverless-esbuild/issues/158

[floydspace]

it could be a valuable step toward the serverless-esbuild v2

[samchungy]

I'll look to raise some PRs just shortly after the new years, in case someone is wondering.