Add feature negotiation on Events API, change supported feature attribute in API response to match the negotiated one

Resolve "Security PKI (Certificates) Authentication and Authorization"

Closes #111

See merge request !116

Add feature negotiation on Events API, change supported feature attribute in...

See merge request !119

Merge remote-tracking branch 'origin/staging' into OCF134-provider-management-api-supported-feature-negotiation

Resolve "Provider Management API supported feature negotiation"

Closes #134

See merge request !117

fix name of capif_security_api-28 test

See merge request !121

Update data types on tests according to changes on v18.7.0

See merge request !124

Resolve "Remove test capif_api_acl-5"

See merge request !125

Merge branch 'OCF141-review-and-implement-changes-from-3gpp-specs-v18-4-0-to-v18-7-0-latest-rel18' into 'staging'

Ocf141 review and implement changes from 3gpp specs v18 4 0 to v18 7 0 latest rel18

See merge request !123