Conditional late initialization configuration

### What problem are you facing?

Crossplane performs [late initialization](https://docs.crossplane.io/v1.12/concepts/managed-resources/#late-initialization) to fully represent the external resource in the Kube API by filling the spec of the Managed resource with the default values from the cloud provider. Upjet automates this and exposes a [configuration interface](https://github.com/upbound/upjet/blob/main/docs/add-new-resource-long.md#late-initialization-configuration) to ignore provided field paths in case of a conflict that couldn't be automatically resolved.

We observe some cases where these conflicts only happen under certain conditions, for example:

- With [AWS Lambda Function](https://github.com/upbound/provider-aws/issues/692#issuecomment-1548184664), skip late initialization of `source_code_hash` if `imageUri` is provided, not `s3_key` or `filename`.
- With [AWS RDS DB Instance](https://github.com/upbound/provider-aws/issues/723), skip late initialization of "allocated_storage", "engine", "engine_version", "password" and "username" if `replicateSourceDb` is set.

### How could Upjet help solve your problem?

Provide a configuration interface for late initialization that would enable conditional late initialization.