fix(envoy-plugin): Fix destination IP and port resolution and add TLS version

[anurag-rajawat]

Description

This PR:

• Fixes a bug in destination IP address resolution which was using downstream connection local address. Now it uses Upstream connection remote address.
• Adds a new header for TLS version being used in downstream and upstream TLS connection.

For ref: https://www.envoyproxy.io/docs/envoy/latest/intro/arch_overview/advanced/attributes#upstream-attributes

Does this PR introduce a breaking change?
No.

Checklist

• PR title follows the <type>: <description> convention.
• I use conventional commits in my commit messages.
• I have updated the documentation accordingly.
• I Keep It Small and Simple: The smaller the PR is, the easier it is to review and have it merged.
• I have performed a self-review of my code.
• I have added tests that prove my fix is effective or that my feature works.
• New and existing unit tests pass locally with my changes.

Additional information for reviewer

Mention if this PR is part of any design or a continuation of previous PRs