feat: enhanced server functionality

Description

OCM engine UI requires additional endpoints in OCM engine in order to display required functional:

• Sync endpoint URL between Gateway and Rest mode
• Enable cors for agent in REST mode
• Swagger JSON human readable
• Include Dto models into gateway-swagger.json
• Fix some typos
• Get list of created credential definitions
• Get one credential definition
• Get list of credentials using query filters
• Get one credential
• Decline credential
• Delete credential
• Get all received basic messages using query filters
• Delete basic message by id
• Deleting connection by id
• Get list proof request records using query filters
• Delete proof request
• Short Url for offer credential message
• Short Url for request proof message
• Add additional tag into offered credential and proof request to

Related issues

#41 (closed) #50 (closed)

Checklist

• I have updated the documentation (if necessary)
• I have added unit tests for new functionality (if applicable)
• My code follows the style guidelines of this project
• I have tested this code on my local machine before submitting this MR

Reviewers

@zdravko.iliev