feat(rust): add dedicated TCP/TLS producer and consumer examples

[atharvalade]

Which issue does this PR close?

Closes #2810

Rationale

Users had no dedicated TLS examples in examples/rust/, making TLS configuration discoverable only through CLI args and source code.

What changed?

No dedicated TCP/TLS examples existed despite full TLS support in the Rust SDK. Users had to discover --tcp-tls-enabled, --tcp-tls-domain, and --tcp-tls-ca-file flags by reading source.

Added tcp-tls-producer and tcp-tls-consumer examples using IggyClientBuilder with .with_tls_enabled(true), .with_tls_domain("localhost"), and .with_tls_ca_file("core/certs/iggy_ca_cert.pem"). Updated Cargo.toml with example entries and args.rs with stream/topic name mappings.

Local Execution

Passed. cargo fmt --check and cargo clippy -p iggy_examples --examples both clean.

AI Usage

1. Opus 4.6
2. guided by existing getting-started examples and IggyClientBuilder API
3. Compiled and linted locally, verified code follows existing patterns exactly
4. Yes

[atharvalade]

Resolved

[github-actions]

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