feat: [RPT] Update RPT client to version 1.5

[CharlesDuboisSAP]

Context

• https://github.com/SAP/ai-sdk-java-backlog/issues/423
• [Java 1.24.0] RPT 1.5 ai-sdk#683

Add RPT 1.5 support

Feature scope:

• Generated new spec
• Migrated spec-update.yaml to new spec
• Fixed RptClient.tableCompletion, should be (File, String)
  • fix: [OpenAPI] String properties are not mistakenly generated as File anymore cloud-sdk-java#1260
• Added new tests for new explanation feature
• Preserved existing RPT 1.0 alongside to the new RPT 1.5 for backwards compatibility / support

Definition of Done

• Functionality scope stated & covered
• Tests cover the scope above
• Error handling created / updated & covered by the tests above
• Aligned changes with the JavaScript SDK
• Documentation updated
• Release notes updated
  • Mini migration guide

[ZhongpinWang]

I see in the PR, the rpt 1.0 client is replaced by 1.5. I don't think it is possible to replace the support for the old model already by now or any time this year (according to the sap notes).

@CharlesDuboisSAP @Jonas-Isr

[vladimir-a-sap]

I see in the PR, the rpt 1.0 client is replaced by 1.5. I don't think it is possible to replace the support for the old model already by now or any time this year (according to the sap notes).

@CharlesDuboisSAP @Jonas-Isr

addressed: preserved the old client and api, moved the new one to a separate dedicated package

[ZhongpinWang]

We are leaning towards having one spec for all models in the future. So changes in the spec should (hopefully) be backward compatible and could be applicable to the old models as well. So e.g. spec version 1.6.0 is for all models available. Not spec 1.0 is for rpt 1.0 and spec 1.5 is for rpt 1.5.

Old models are of course still supported. Same for rpt 1.5 if 1.6 comes out.

[Jonas-Isr]

Only minor comments. LGTM otherwise :)

[vladimir-a-sap]

lgtm

[Jonas-Isr]

👍