feat: Add buf support for openapi v3

[gilbahat]

Add buf support for openapi v3 via gnostic plugin

Description

This adds support for generating openapi v3 via the buf gnostic plugin, for services that require openapi v3 instead of v2

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Summary by CodeRabbit

• New Features
  • Introduced a new configuration file for generating OpenAPI v3 specifications, enhancing integration capabilities.
• Documentation
  • Added details regarding the versioning and plugin configurations for improved clarity on usage.

[coderabbitai]

📝 Walkthrough

Walkthrough

This pull request introduces a new configuration file, buf/buf.gen.gnostic.yaml, for the Buf tool, aimed at generating OpenAPI v3 specifications. The configuration specifies the version as v2, enables the managed feature, and includes a plugin configuration that utilizes a remote plugin to output the generated files to the current directory.

Changes

File	Change Summary
buf/buf.gen.gnostic.yaml	New configuration file created specifying version v2, enabling managed feature, and configuring plugin for OpenAPI generation.

Suggested reviewers

• julienrbrt
• tac0turtle

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📜 Recent review details

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📥 Commits

Reviewing files that changed from the base of the PR and between 26afbaf and 5d0acdb.

📒 Files selected for processing (1)

• buf/buf.gen.gnostic.yaml (1 hunks)

✅ Files skipped from review due to trivial changes (1)

• buf/buf.gen.gnostic.yaml

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[julienrbrt]

This creates a new folder while we have a proto folder for each buf modules, and this is being called nowhere.