support NODE_PATH in standalone build

[SteffenDE]

also allows to pass a path with separator

References #19391.
References #16274.

[coderabbitai]

Walkthrough

The changes modify NODE_PATH handling across two modules. In the node compile module, NODE_PATH expansion changes from a single string to split paths using the system path delimiter for module resolution. In the standalone build script, the explicit NODE_PATH environment variable setting is removed from the Bun.build configuration. These adjustments alter how additional module resolution paths are provided during compilation and build processes.

🚥 Pre-merge checks | ✅ 2

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately describes the main change: adding support for NODE_PATH in the standalone build, which is what the changes accomplish.
Description check	✅ Passed	The description is related to the changeset, explaining that it adds NODE_PATH support and allows passing paths with separators, which aligns with the code modifications.

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