feat: Add issue template for Story

[gs-olive]

Description

• Create template for proposing new stories, which include multiple issues/features/PRs all related under a key central theme
• Fix numbering in bug report template
• Add default "Story" label

Type of change

• New feature (non-breaking change which adds functionality)

Checklist:

• [ x ] My code follows the style guidelines of this project (You can use the linters)
• [ x ] I have performed a self-review of my own code
• [ x ] I have commented my code, particularly in hard-to-understand areas and hacks
• [ x ] I have made corresponding changes to the documentation
• [ x ] I have added tests to verify my fix or my feature
• [ x ] New and existing unit tests pass locally with my changes
• [ x ] I have added the relevant labels to my PR in so that relevant reviewers are notified

[narendasan]

LGTM