Add initial REST support

[nuclearcat]

As we implemented kcidb-rest interface on server side, we need to make optional (for now) support for it in client library.

[Copilot]

Pull Request Overview

This PR adds initial support for submitting reports over a REST API in the client library, making the REST functionality optional based on an environment variable.

• Added REST URI validation using a regex pattern
• Implemented a new rest_submit() function for REST-based submissions and updated submit() and future_submit() to support REST
• Early return in init() when KCIDB_REST is set, bypassing the traditional database and MQ setup

Comments suppressed due to low confidence (1)

kcidb/init.py:156

• LOGGER is used but not defined in this file; please initialize a logger or use logging.getLogger to properly log errors.

LOGGER.error("Error submitting report: %s", e)

[Copilot]

Pull Request Overview

This PR adds optional REST support to the client library, enabling report submissions over a REST API if the environment variable KCIDB_REST is present.

• Introduces required imports for REST support (os, re, requests).
• Adds a REST URI validation regex, validate_rest_uri, and rest_submit method to handle REST submissions.
• Updates the init, submit, and future_submit methods to conditionally use REST over the traditional MQ publishing.

[Copilot]

Pull Request Overview

This PR introduces initial support for REST submissions in the client library by leveraging a new environment variable (KCIDB_REST) to enable an alternative submission path. Key changes include:

• Importing and using new modules (os, re, and requests) for REST functionality.
• Adding new methods for validating REST URIs and submitting reports over a REST API.
• Modifying the submit and future_submit methods to prioritize REST submission when available.

Comments suppressed due to low confidence (1)

kcidb/init.py:134

• [nitpick] The variable name 'vre' is ambiguous; consider renaming it to something more descriptive (e.g., 'regex_match' or 'rest_regex').

vre = self.REST_REGEX