Upgrade to Langium 2.1.3

[martin-fleck-at]

Langium > 2.0.0 only supports ESM so we refactor the extension to ESM

Setup Changes

• Set type to 'module' in package.json and update configs accordingly
• Use esbuild to develop in ESM but compile to CJS for VSX

Code Changes

• Adapt all relative imports to use '.js' extension (even for '.ts')
• Remove now obsolete adaptations of workspace manager

Test Changes

• Provide custom Jest configuration for ES modules
• Use 'jest.useFakeTimers()' as specified in Jest documentation for ESM
• Add '--experimental-vm-modules' Node flag to ESM test executions
• Add 'NODE_NO_WARNINGS' environment variable to ignore ESM warning
• Use unique report file names as we need to run twice (CJS, ESM)
• Add display name to all test configs for nicer output
• Adapt launch configs to properly debug single test or all tests

[github-actions[bot]]

Unit Test Results

    3 files  ±0    30 suites  ±0   2m 23s :stopwatch: +43s   68 tests ±0    68 :heavy_check_mark: ±0  0 :zzz: ±0  0 :x: ±0  207 runs  ±0  207 :heavy_check_mark: ±0  0 :zzz: ±0  0 :x: ±0 

Results for commit 2c4dba64. ± Comparison against base commit b94137d7.

:recycle: This comment has been updated with latest results.