feat: consolidate json streaming

[cmars]

Eliminating most uses of JSON.stringify, replacing with JsonStreamStringify.

Refactor & consolidation of TestCommandResult to pass objects rather than (potentially large) JSON strings.

Why?

• JSON.stringify in jsonStringifyLargeObject can still crash the node process with an OOM in some cases
• If an object fits in memory, we should be able to dump it to stdout

This isn't a perfect solution to all OOM problems the CLI has, but it may address several potential cases.

What's not addressed here:

• Unmanaged C/C++ depgraph output
• IaC

These might be addressed in a followup.

TODO: tests, etc. this is a proof-of-concept

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