Add cds specific vocabularies for analytics support

[UweSchwerk]

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POC for supporting non-OData annotations in CDS LSP.

Still to do (by cds/analytics colleagues):

• add decent descriptions in the three new vocabularies (search for TODOs)
• check feasibility of the content that has been drafted so far (for Terms: $AppliesTo, usage of Edm.PropertyPath and Edm.NavigationPropertyPath)
• (Done by now) verify modeling of enum values as string with @Validation.AllowedValues - alternative is "real" OData EnumType (see @Aggreagtion.defaulthttps://github.com/SAP/open-ux-tools/pull/1522/files#r1410695634)

Here is some background explanation and also a demo on how this looks in action: https://github.com/SAP/open-ux-tools/assets/107176531/121edf7c-73b1-4abf-8377-36f5abc625df

After converting allowed values to odata enumTypes it looks as follows:

for @Aggregartion.default (both value lists are added up):

Regarding conflicting vocabulary alias Aggregation (there is an Odata vocabulary and now a cds specific one with the same name): current workaround is that the cds terms are logically added to the OData vocabulary. This way we could restrict the code changes to the vocabulary package only. Drawback (I hope acceptable) is that hover/cc item text for @Aggregation.default show wrong namespace:

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Latest commit: 8c448b980ee1e9aa1138b4187d7310a488a640ad

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Quality Gate passed

Kudos, no new issues were introduced!

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96.3% Coverage on New Code
0.0% Duplication on New Code

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