[platform] Platform support for mutual-auth when client cert validation is enabled

[streddy-yb]

• YugabyteDB exposes a new flag called node_to_node_encryption_use_client_certificates to validate validate client certificates when client-to-node tls is enabled. Platform should present a client cert when talking to master/t-server RPC end points when this flag is enabled.
• Platform should also support a workflow for custom certs use case
• Expose a new option to enable node_to_node_encryption_use_client_certificates when node-to-node tls is enabled.