refactor(update-sapui5-types script): Adjust metadata generation of UI5 types

[maxreichmann]

JIRA: CPOUI5FOUNDATION-973

Restructure of format in api-extract.json:

• Collection and metadata generation of aggregation, association , event, method, property values (incl. borrowed ones)
• Incorporate existing collection of defaultAggregation values
• Adjust existing usage of api-extract.json (linting + tests)

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TODO: Compare performance/filesize impacts of following two approaches:

1. Collect all metadata (incl. borrowed) with update-sapui5-types script (maybe better performance during runtime; higher filesize of api-extract.json)
2. Collect only metadata which is not borrowed by parent objects by using placeholders (maybe lower performance during runtime; lower filesize of api-extract.json)