Add feature-request.yml

[igiloh-pinecone]

Problem

We are missing an issue template for feature requests and suggestions

Solution

Added feature request template which is based on Pinecone.io's default template.

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update
• Infrastructure change (CI configs, etc)
• Non-code change (docs, etc)
• None of the above: (explain here)

[miararoy]

lgtm