Add mediator and simple client implementation #6233

Job	Run time
aries_vcx_clippy (credx,vdrtools_wallet)	3m 28s
aries_vcx_core_clippy (credx,vdrtools_wallet)	3m 0s
verify-code-formatting	21s
aries_vcx_clippy (vdr_proxy_ledger)	4m 31s
aries_vcx_core_clippy (vdr_proxy_ledger)	3m 30s
aries_vcx_no_features_clippy	2m 28s
workspace_clippy	4m 24s
workflow-setup	28s
test-integration-aries-vcx-mysql	4m 10s
test-integration-aries-vcx	15m 3s
test-unit-workspace	5m 24s
build-docker-vdrproxy	6s
code-coverage-aries-vcx-integration-modular-libs	17m 56s
test-integration-libvcx	3m 42s
workflow-setup-check	2s
x86_64-unknown-linux-gnu	10m 17s
test-integration-did-crate	4m 38s
test-integration-mediator	18s
x86_64-unknown-linux-musl	11m 45s
test-integration-node-wrapper (18.x)	10m 17s
x86_64-apple-darwin	9m 43s
aarch64-apple-darwin	46m 34s
test-integration-aries-vcx-vdrproxy	14m 14s
publish-docker-vdrproxy	14s
make-release	0s
publish-napi	56s
publish-node-wrapper	40s
publish-agent-core	54s
	2h 59m 3s

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