SA5#149 OpenAPI SS changes for Rel-18

For the following approved contributions in June 2023 SA Plenary:

• S5-233961 Rel18 CR TS28.541 NRM enhancements for DCCFunction
• S5-233977 TS28.623 Rel18 correction to stage 3 implementation for MnSInfo and MnsRegistry
• S5-234001 Rel-18 CR TS 28.541 Update SliceNRM YAML to align with stage2
• S5-234139 Rel-18 CR 28.541 Update NRM enhancements for NWDAFFunction
• S5-234586 Add NetworkSliceController and NetworkSliceSubnetController IOCs to support asynchronous LCM operations
• S5-234657 Rel-18 CR TS 28.105 Modelling ML Entity
• S5-234735 Rel18 CR TS28.541 NRM enhancements for NRFFunction
• S5-234738 Rel18 CR TS28.541 NRM enhancements for CHFFunction
• S5-234739 Rel18 CR TS28.541 NRM enhancements for MFAFFunction
• S5-234742 Rel18 CR TS28.541 Improve EP_Transport model to clarify connection point info
• S5-234803 TS28.541 Rel18 Correction to multiplicity definition to nRPciList and stage 3 implementation of both NRPciList and CSonPciList
• S5-234805 Rel-18 CR TS 28.623 Correcting the min and max Items possible for fiveQIValue attribute in Stage 3
• S5-234812 Rel-18 CR 28.541 fixing coverageArea

Also versions are updated for related OpenAPI files. For OpenAPI files with no Rel18 version, the latest Rel17 versions are copied to Rel18 branch.