Remove unused oob APIs, move code to `libvcx_core` #6452

Job	Run time
verify-code-formatting	19s
workflow-setup	30s
aries_vcx_core_clippy (credx,vdrtools_wallet)	3m 25s
aries_vcx_clippy (credx,vdrtools_wallet)	4m 5s
aries_vcx_core_clippy (vdr_proxy_ledger)	3m 19s
aries_vcx_clippy (vdr_proxy_ledger)	2m 24s
workspace_clippy	3m 32s
test-integration-aries-vcx	2m 5s
code-coverage-aries-vcx-integration-modular-libs	6m 46s
build-docker-vdrproxy	11s
x86_64-unknown-linux-gnu	4m 44s
x86_64-unknown-linux-musl	11m 4s
test-integration-aries-vcx-mysql	3m 54s
test-integration-did-crate	1m 47s
x86_64-apple-darwin	3m 45s
test-integration-libvcx	2m 51s
aarch64-apple-darwin	19m 9s
test-integration-node-wrapper (18.x)	10m 21s
test-unit-workspace	3m 3s
workflow-setup-check	1s
test-integration-aries-vcx-vdrproxy	5m 13s
publish-docker-vdrproxy	10s
make-release	0s
publish-napi	1m 23s
publish-node-wrapper	33s
publish-agent-core	56s
	1h 35m 30s

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