[Feat] CC: Add Cloud Connect (CC) v3 service

[artem-lifshits]

What this does

Implements the OpenTelekomCloud Cloud Connect (CC) v3 service SDK, covering all six API groups from the cloud-connect API reference.

Acceptance tests

=== RUN   TestCentralNetworkLifeCycle
--- PASS: TestCentralNetworkLifeCycle (9.68s)
=== RUN   TestCentralNetworkList
--- PASS: TestCentralNetworkList (0.97s)
=== RUN   TestCentralNetworkQuotaList
--- PASS: TestCentralNetworkQuotaList (0.87s)
=== RUN   TestCentralNetworkCapabilityList
--- PASS: TestCentralNetworkCapabilityList (1.24s)
PASS

Process finished with the exit code 0

=== RUN   TestGlobalConnectionBandwidthLifeCycle
--- PASS: TestGlobalConnectionBandwidthLifeCycle (1.75s)
=== RUN   TestGlobalConnectionBandwidthList
--- PASS: TestGlobalConnectionBandwidthList (0.90s)
=== RUN   TestGlobalConnectionBandwidthConfigs
--- PASS: TestGlobalConnectionBandwidthConfigs (1.04s)
=== RUN   TestGlobalConnectionBandwidthSites
--- PASS: TestGlobalConnectionBandwidthSites (0.85s)
=== RUN   TestGlobalConnectionBandwidthSupportBindings
--- PASS: TestGlobalConnectionBandwidthSupportBindings (0.88s)
PASS

Process finished with the exit code 0

=== RUN   TestCentralNetworkPolicyLifeCycle
--- PASS: TestCentralNetworkPolicyLifeCycle (53.70s)
PASS

Process finished with the exit code 0