Add mediator and simple client implementation #6327

Job	Run time
aries_vcx_clippy (credx,vdrtools_wallet)	3m 12s
aries_vcx_core_clippy (credx,vdrtools_wallet)	2m 37s
aries_vcx_clippy (vdr_proxy_ledger)	3m 38s
aries_vcx_core_clippy (vdr_proxy_ledger)	3m 19s
aries_vcx_no_features_clippy	3m 22s
workflow-setup	25s
verify-code-formatting	21s
workspace_clippy	6m 28s
test-unit-workspace	7m 33s
test-integration-aries-vcx-mysql	6m 48s
code-coverage-aries-vcx-integration-modular-libs	21m 56s
test-integration-aries-vcx	16m 49s
test-integration-did-crate	5m 47s
build-docker-vdrproxy	6s
test-integration-libvcx	6m 17s
workflow-setup-check	1s
test-integration-node-wrapper (18.x)	6m 5s
x86_64-unknown-linux-gnu	11m 0s
x86_64-unknown-linux-musl	17m 27s
x86_64-apple-darwin	15m 16s
aarch64-apple-darwin	45m 57s
test-integration-aries-vcx-vdrproxy	17m 10s
publish-docker-vdrproxy	10s
make-release	0s
publish-napi	0s
publish-node-wrapper	0s
publish-agent-core	0s
	3h 21m 44s

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