Add mediator and simple client implementation #6274

Job	Run time
workspace_clippy	2m 59s
verify-code-formatting	18s
aries_vcx_clippy (credx,vdrtools_wallet)	2m 30s
workflow-setup	33s
aries_vcx_clippy (vdr_proxy_ledger)	2m 50s
aries_vcx_core_clippy (credx,vdrtools_wallet)	2m 33s
aries_vcx_no_features_clippy	2m 0s
aries_vcx_core_clippy (vdr_proxy_ledger)	2m 49s
workflow-setup-check	2s
test-unit-workspace	3m 24s
build-docker-vdrproxy	3m 27s
code-coverage-aries-vcx-integration-modular-libs	3m 24s
test-integration-aries-vcx	3m 26s
test-integration-aries-vcx-mysql	3m 24s
x86_64-unknown-linux-gnu	3m 23s
x86_64-unknown-linux-musl	3m 22s
test-integration-did-crate	3m 25s
x86_64-apple-darwin	3m 20s
test-integration-libvcx	3m 23s
aarch64-apple-darwin	3m 31s
test-integration-node-wrapper (18.x)	3m 23s
make-release	1s
test-integration-aries-vcx-vdrproxy	1s
publish-docker-vdrproxy	1s
publish-napi	1s
publish-node-wrapper	1s
publish-agent-core	1s
	57m 32s

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