feat(platform)!: transient properties

[QuantumExplorer]

Issue being fixed or feature implemented

Properties such as the preorderSalt in DPNS are important for validation but not important after validation.

What was done?

In this PR we add transient properties to data contracts. Transient properties are a way to send data to Platform for validation without having the data stay stored in the state. These properties are discarded after validation.

The reason this was done before V1 is that doing it after might prove to be really complicated.

How Has This Been Tested?

Breaking Changes

This is a breaking change.

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have added or updated relevant unit/integration/functional/e2e tests
• I have added "!" to the title and described breaking changes in the corresponding section if my code contains any
• I have made corresponding changes to the documentation if needed

For repository code-owners and collaborators only

• I have assigned this pull request to a milestone