refactor: better method names

[lars-reimann]

Summary of Changes

I've dropped the lengthy OrUndefined and OrEmpty suffixes from methods of the NodeMapper and the functions to access node properties. Instead, they now have a stream prefix if they return a stream or a get prefix/no prefix otherwise. This better aligns with the name convention of API elements provided by langium.

[github-actions]

🦙 MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ REPOSITORY	git_diff	yes		no	0.07s
✅ TYPESCRIPT	eslint	35	0	0	6.78s
✅ TYPESCRIPT	prettier	35	0	0	2.45s

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[codecov]

Codecov Report

Merging #661 (0381531) into main (45ca2a5) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main      #661   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           63        63           
  Lines         8846      8821   -25     
  Branches      1762      1762           
=========================================
- Hits          8846      8821   -25     

Files	Coverage Δ
src/cli/generator.ts	100.00% <100.00%> (ø)
src/language/builtins/safe-ds-annotations.ts	100.00% <100.00%> (ø)
src/language/builtins/safe-ds-module-members.ts	100.00% <100.00%> (ø)
src/language/helpers/nodeProperties.ts	100.00% <100.00%> (ø)
src/language/helpers/safe-ds-node-mapper.ts	100.00% <100.00%> (ø)
src/language/lsp/safe-ds-formatter.ts	100.00% <100.00%> (ø)
src/language/partialEvaluation/model.ts	100.00% <100.00%> (ø)
...age/partialEvaluation/safe-ds-partial-evaluator.ts	100.00% <100.00%> (ø)
src/language/scoping/safe-ds-scope-provider.ts	100.00% <100.00%> (ø)
src/language/typing/safe-ds-class-hierarchy.ts	100.00% <100.00%> (ø)
... and 21 more

[lars-reimann]

🎉 This PR is included in version 0.2.0 🎉

The release is available on:

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• GitHub release

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