add toBuilder to lombok @Builder annotation

[tylersouthwick]

Issue #, if available:
#331

Description of changes:
Allows an immutable copy of the resource model and pojos to be created, leveraging lombok's toBuilder construct

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[ammokhov]

thank you for your contribution.

the change looks good to me but since it's a change in pojo the CI/CD will always pass. Could you paste some sam test/contract test results to verify that it does not break payload deserialization and works as expected.

[johnttompkins]

thank you for your contribution.

the change looks good to me but since it's a change in pojo the CI/CD will always pass. Could you paste some sam test/contract test results to verify that it does not break payload deserialization and works as expected.

Payload deserialization should be alright I think. This just adds a generated method