Implement settlementModels management - GET and PUT operations

[ggrg]

Goal:

As a Hub Operator
I want to have the functionality on the admin API (GET /settlementModels, GET /settlementModels/{name}, PUT /settlementModels/{name}) to request information about all available settlementModels, to request information about settlementModels by name, and disable/enable an existing settlementModel by changing its isActive state
so that I can further mange the existing settlement models

Notes:

• As part of this story, please also change POST /settlementModel to POST /settlementModels (plural) moved to Implement autoPositionReset config to settlementModel #1211

Tasks:

• Add PUT/GET routes with Joi validations, where applicable
  • Include Implement autoPositionReset config to settlementModel #1211 autoPositionReset property to GET requests
• Add ENUMS to shared lib, if applicable
• Create handler scripts
• Implement DAO scripts
• Provide unit tests to cover newly added functionality
• Address PR comments

Acceptance Criteria:

• Designs are up-to date
• Unit Tests pass
• Integration Tests pass
• Code Style & Coverage meets standards
• Changes made to config (default.json) are broadcast to team and follow-up tasks added to update helm charts and other deployment config.

Pull Requests:

• #1207- Implement settlementModels management - GET and PUT operations  central-ledger#588
• Feature/1207 Implement settlement models management get and put operations central-services-shared#181

Follow-up:

• N/A

Dependencies:

• N/A

Accountability:

• Owner: @ggrg
• QA/Review: @ggrg