feat: issue ratio signal

[huang-benny]

This PR adds a new openIssuesRatio signal to the QUALITY pillar that measures the percentage of open issues relative to total issues in a repository. This provides insight into how well a package maintainer is keeping up with issue resolution.

Changes:

• Fetches both open and total issue counts from GitHub GraphQL API
• Uses issues(states: OPEN) and issues queries to get counts
• Returns 100 (worst score) if issue data is unavailable or total issues is 0
• Added calculateOpenIssuesRatio() function to calculate the percentage
• Rounds ratio to 1 decimal place for precision

Scoring:

• ≤25% open issues: 5 stars
• 26-50% open issues: 4 stars
• 51-75% open issues: 3 stars
• 76-90% open issues: 2 stars
• 90%+ open issues: 1 star

Example CLI Input and Output:

cdk-construct-analyzer cdk-ecr-deployment --details  

LIBRARY: cdk-ecr-deployment
VERSION: 4.0.3

OVERALL SCORE: 76/100

---

SUBSCORES
  MAINTENANCE :           67/100
  QUALITY     :           80/100
  POPULARITY  :           88/100

---

=== MAINTENANCE ===                                   SCORE  WEIGHT
— Time To First Response ............................ ★★☆☆☆    15
— Provenance Verification ........................... ★★★★★    10
— Release Frequency ................................. ★★★★☆    10
— Number Of Contributors - Maintenance .............. ★★★★☆    5
— Open Issues Ratio ................................. ★★★★★    5

=== QUALITY ===                                       SCORE  WEIGHT
— Documentation Completeness ........................ ★★★★☆    5
— Tests Checklist ................................... ★★★☆☆    5
— Author Package Count .............................. ★★★★★    5
— Release Notes Include Feats And Fixes ............. ★★★★★    5
— Stable Versioning ................................. ★★★★☆    5

=== POPULARITY ===                                    SCORE  WEIGHT
— Weekly Downloads .................................. ★★★★★    15
— Github Stars ...................................... ★★★★☆    10
— Number Of Contributors - Popularity ............... ★★★★☆    5

[kaizencc]

nits