ISSUE-4259: Change to atomic for dal context metrics

[BohuTANG]

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Summary

Summary about this PR:

1. Change the DalMetrics update from RwLock to Atomic operation
2. Remove un-used metrics: scan_seek_cost_ms and scan_seeks
3. Add common/contexts for the common used context

Changelog

• Improvement
• Performance Improvement

Related Issues

Fixes #4259

Test Plan

Unit Tests

Stateless Tests

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