feat: add `addDeploymentTargetByDomainId`

[stonecharioteer]

• Adds a function to add a deployment target using the sygma domain ID
• Adds an internal function to get the deployment target string from the domain ID since this makes it easier to use existing code to not change any behaviour whatsoever.
• Added a storage mapping variable to store the mapping of domainId x deployment target name.
• Copied over testAddDeploymentTargetWithArgsAnvil into testAddDeploymentTargetByDomainIdWithArgsAnvil changing only the call to the function so that it uses the domain ID now.

[stonecharioteer]

Closes #20