Add BILLING_EVENTS_RESPONSE feature

[Hazel-Datastax]

What this PR does:

Which issue(s) this PR fixes:
Fixes #

Checklist

• Changes manually tested
• Automated Tests added/updated
• Documentation added/updated
• CLA Signed: DataStax CLA

[github-actions]

📈 Unit Test Coverage Delta vs Main Branch

Metric	Value
Main Branch	52.50%
This PR	52.55%
Delta	🟢 +0.05%
✅ Coverage improved!

[github-actions]

Unit Test Coverage Report

Overall Project	52.55% -0.02%	🍏
Files changed	89.63%	🍏

File	Coverage
DefaultBilling.java	96.96% -3.04%	🍏
Billing.java	94.29% -5.71%	🍏
ApiFeature.java	91.18%	🍏
BillingResponseFilter.java	83.33% -16.67%	🍏

[github-actions]

📉 Integration Test Coverage Delta vs Main Branch (dse69-it)

Metric	Value
Main Branch	72.50%
This PR	72.46%
Delta	🔴 -0.05%
⚠️ Coverage decreased

[github-actions]

Integration Test Coverage Report (dse69-it)

Overall Project	72.46% -0.11%	🍏
Files changed	31.1%	❌

File	Coverage
ApiFeature.java	91.18%	🍏
Billing.java	74.29% -25.71%	❌
BillingResponseFilter.java	49.02% -50.98%	❌
DefaultBilling.java	0% -33.91%	❌

[github-actions]

📉 Integration Test Coverage Delta vs Main Branch (hcd-it)

Metric	Value
Main Branch	73.84%
This PR	73.80%
Delta	🔴 -0.04%
⚠️ Coverage decreased

[github-actions]

Integration Test Coverage Report (hcd-it)

Overall Project	73.8% -0.11%	🍏
Files changed	31.1%	❌

File	Coverage
ApiFeature.java	91.18%	🍏
Billing.java	74.29% -25.71%	❌
BillingResponseFilter.java	49.02% -50.98%	❌
DefaultBilling.java	0% -33.91%	❌