feat: add new DID runtime APIs to aid with DID deletion #985

Job	Run time
Get HEAD commit message	5s
Check formatting	1m 53s
Check cargo-deny rules	1m 39s
Run Clippy checks (--all-targets --all-features)	16m 15s
Run Chopsticks tests	2h 2m 31s
Run Clippy checks (--all-targets)	15m 55s
Run Clippy checks (--target wasm32-unknown-unknown --no-default-features --workspace --exclude ki...	7m 52s
Run Cargo tests	0s
Check Rustdoc	0s
Run try-runtime	0s
Test runtime benchmarks	0s
Trigger GitLab CI	0s
	2h 46m 10s

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