fix: make override default impl return empty map and use u32 instead of usize

[ChaoticTempest]

fixes:

• make override default have empty map instead of null
• make all usize in contract/ code use u32 instead due to architectural differences

[ppca]

LGTM

[github-actions]

Terraform Feature Environment Destroy (dev-759)

Terraform Initialization ⚙️success

Terraform Destroy success

Show Destroy Plan

No changes. No objects need to be destroyed.

Either you have not created any objects yet or the existing objects were
already deleted outside of Terraform.

Destroy complete! Resources: 0 destroyed.

Pusher: @ChaoticTempest, Action: pull_request, Working Directory: ``, Workflow: Terraform Feature Env (Destroy)