Envoy extensions for reverse connections

[basundhara-c]

Commit Message: This commit collates the envoy extensions for reverse connections, described in this github issue. A detailed description of the changes is provided in examples/reverse_connection/README.md. This PR is strictly tied with #37368.
Additional Description:
Risk Level:
Testing:
Docs Changes:
Release Notes:
Platform Specific Features:
[Optional Runtime guard:]
[Optional Fixes #Issue]
[Optional Fixes commit #PR or SHA]
[Optional Deprecated:]
[Optional API Considerations:]

Signed-off-by: Basundhara Chakrabarty [email protected]
Co-authored-by: Arun Vasudevan [email protected]
Co-authored-by: Tejas Sangol [email protected]
Co-authored-by: Aditya Jaltade [email protected]

[repokitteh-read-only]

Hi @basundhara-c, welcome and thank you for your contribution.

We will try to review your Pull Request as quickly as possible.

In the meantime, please take a look at the contribution guidelines if you have not done so already.

🐱

Caused by: #37367 was opened by basundhara-c.

see: more, trace.

[repokitteh-read-only]

CC @envoyproxy/api-shepherds: Your approval is needed for changes made to (api/envoy[\w/]*/(v1alpha\d?|v1|v2alpha\d?|v2))|(api/envoy/type/(matcher/)?\w+.proto).
CC @envoyproxy/api-shepherds: Your approval is needed for changes made to (api/envoy/|docs/root/api-docs/).
envoyproxy/api-shepherds assignee is @abeyad
CC @envoyproxy/api-watchers: FYI only for changes made to (api/envoy/|docs/root/api-docs/).

🐱

Caused by: #37367 was opened by basundhara-c.

see: more, trace.

[wbpcode]

Hi, thanks for contribution to Envoy. But any new extension should be sponsored by one of maintainer to ensure the extension meet our requirements (style, etc.)

Did you find any one to help with this new extension?