Add mediator and simple client implementation #6241

Job	Run time
verify-code-formatting	16s
aries_vcx_clippy (credx,vdrtools_wallet)	3m 46s
aries_vcx_clippy (vdr_proxy_ledger)	4m 58s
workflow-setup	32s
workspace_clippy	4m 59s
aries_vcx_core_clippy (credx,vdrtools_wallet)	3m 25s
aries_vcx_core_clippy (vdr_proxy_ledger)	3m 54s
aries_vcx_no_features_clippy	3m 8s
test-unit-workspace	2m 49s
build-docker-vdrproxy	9s
workflow-setup-check	3s
code-coverage-aries-vcx-integration-modular-libs	4m 20s
test-integration-aries-vcx-mysql	3m 22s
test-integration-aries-vcx	4m 21s
test-integration-did-crate	3m 19s
test-integration-libvcx	2m 53s
test-integration-node-wrapper (18.x)	4m 19s
x86_64-unknown-linux-gnu	4m 16s
x86_64-unknown-linux-musl	4m 13s
x86_64-apple-darwin	4m 17s
aarch64-apple-darwin	4m 16s
test-integration-aries-vcx-vdrproxy	4m 2s
publish-docker-vdrproxy	13s
publish-napi	1s
make-release	1s
publish-node-wrapper	1s
publish-agent-core	1s
	1h 11m 54s

Provide feedback