feat(grpc-sdk,commons,security): cli security client platform, ping route security middleware exceptions

[kon14]

Adds a security client cli platform for use by ConduitPlatform/CLI.
Also excempts / and /health http ping routes from security middleware so that CLI can properly validate Conduit urls.

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update
• Refactor
• Build-related changes
• Other (please describe)

Does this PR introduce a breaking change?

• Yes
• No

The PR fulfills these requirements:

• It's submitted to the main branch
• When resolving a specific issue, it's referenced in the PR's description (e.g. fix #xxx, where "xxx" is the issue number)

If adding a new feature, the PR's description includes:

• A convincing reason for adding this feature