Feature Request: Support optimization flags in the build actions

Description:
We can support several optimizations to improve the build process. This is a feature request to support optimization flags that can be passed to each build action. If an action cannot support a particular optimization, it should error out:

Optimization 1: Use prebuilt binaries

Benefit: Makes build faster

When building dependencies with native modules, use pre-built binaries that are available locally or download from internet. This saves time in recompiling the same binaries over and over again. It can also make the build more stable because sometimes compilation fails or times out.

Requested by build actions:

1. node-npm
2. python-pip

Optimization 2: Remove unnecessary dependencies

Benefit: Produces slim zips

Remove unnecessary dependency libraries, or files or folders from the output artifact. For example, remove tests, test data files, or dependencies that are already available in transitive closure.

Requested by build actions:

1. node-npm
2. python-pip

The issue names the node-npm and python-pip build actions but no files or tests. Start by locating those action implementations and their build-output paths; then determine how each optimization is requested, rejected when unsupported, and verified in the resulting artifacts.