Validate serviceId with endpoint

[balhar-jakub]

Is your feature request related to a problem? Please describe.
There is no place to validate that serviceId conforms to the requested format.

Describe the solution you'd like
Provide a REST API on the API Gateway. This API should live under /conformance/validate and be available under the POST method. The API will accept the serviceId parameter. It will return the information on whether this serviceId is valid under the conformance criteria.

Acceptance Criteria

• The logic will be merged into the v2.x.x branch
• The /conformance/validate API won't require authentication
• The /conformance/validate API will accept serviceId as a parameter
• The /conformance/validate API returns 200 for serviceId that is only a lower case, doesn't contain symbols, and less than 64 characters
• The /conformance/validate API returns 400 when there is an upper case letter
• The /conformance/validate API return 400 when there is a symbol
• The /conformance/validate API return 400 when it is longer than 64 characters. 64 characters are ok. 65 are not.
• The video demo shows the functionality