chore(release): v0.5.0

[thiagoralves]

Version bump to 0.5.0.

Ships since v0.4.22:

• VSCode extension: add hover documentation for IEC data types #55 — VSCode extension: hover docs for built-in IEC data types (user-facing feature)
• refactor: delete ~1100 redundant parse-only tests from compile.test.ts #72/refactor: remove internal duplicate test sections in codegen files #73 — removed redundant parse-only / duplicate codegen tests
• refactor: move misplaced test files to correct directories #74 — moved misplaced test files
• fix: fragile/vacuous assertions in oscat, codesys-import, located-variables tests #75 — fixed fragile/vacuous test assertions
• fix: 9 test files import from dist/ instead of src/ #71 — tests import src/ (accurate coverage) + dist-import guard + package smoke test

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