feat: enable TS in main, fiori

[ilhan007]

The PR introduces the following changes:

project build

• rework the project build to always prepare base and then main, fiori (currently done in parallel) so that Typescript finds all dependencies when running on components from main, fiori.

base package

• several "base" types refactored to pure Enum whenever possible - see ValueState, CalendarType, etc.
• type PopupState removed as not used
• UI5ElementMetadata handles the pure Enum case (see UI5ElementMetadata#validateSingleProperty)

main package

• package enabled to use TS
• Label, Title and Icon are now in written Typescript
• All types are in TS

fiori package

• package enabled to use TS

[ilhan007]

FYI @gmkv