Implement autoPositionReset config to settlementModel

[ggrg]

Goal:

As a Hub Operator
I want to be able to define if position should be automatically reset on settlement model level
so that upon settling a settlement, positions are updated according to the settlement model configuration

Tasks:

• Add settlementModel.autoPositionReset db column [@ggrg]
• Fix POST /settlementModel to plural /settlementModels [@ggrg]
• Update POST /settlementModels admin api to require and populate the newly added column [@ggrg]
• Fix unit tests for central-ledger [@ggrg]
• Update GET /settlementModels and GET /settlementModels/{name} to report autoPositionReset config (moved to Implement settlementModels management - GET and PUT operations #1207)
• Enhance updateSettlementById handler to use the newly added config, so that when autoPositionReset is set to false, settlement transfer is not created [@ggrg]

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.
• Whether positions are to be automatically reset /adjusted upon Settling or not, can be set using config at deployment time by Hub Operators.

Pull Requests:

• feature/1211 Settlement v2 Auto Position Reset  central-ledger#586
• feature/1211 Auto position reset central-settlement#240

Follow-up:

• Create stories to allow position reset for ledgers other than POSITION

Dependencies:

• N/A

Accountability:

• Owner: @ggrg
• QA/Review: @ggrg