[EPIC] EST Endpoint for onboarded devices

[AlexHx8472]

Introduction The Trustpoint shall offer an EST Endpoint for onboarded devices.

Acceptance Criteria

• [ ] Job Story #x : Support /cacerts
• [ ] Job Story #x : Support /simpleenroll
• [ ] Job Story #x : Support /simplereenroll
• [ ] Job Story #x : Support /serverkeygen
• [ ] Job Story #x : Support /csrattrs
• [ ] Job Story #x : Shall provide endpoints for every configured domain separately
• [ ] Job Story #x : Shall be separately configurable for every domain (i.e. enable / disable, ...)
• [ ] Job Story #x : Allow for further distribution of trust stores using the /cacerts method and further url path segments as described in RFC 7030

Note: /fullcmc may be supported if requested / required