feat: NodeJS exports submodules as subpaths

[jkowalleck]

fixes #87

Added

• Explicitly export own first-level submodules via package manifest (via #1066)
  When used with bundlers/packers downstream, this might enable better tree shaking due to scoped imports.

Refactor

• Ease internal tree shaking (via #1066)

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ +0.01% (target: -1.00%)	✅ 100.00% (target: 90.00%)

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (07cb79f)	22788	22377	98.20%
Head commit (7dcdb71)	22902 (+114)	22491 (+114)	98.21% (+0.01%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#1066)	147	147	100.00%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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