fix: update datatype in FieldStats and QueryRow to f64

[nikhilsinhaparseable]

this is required because we ingest as f64
with i64, the type casting fails

Summary by CodeRabbit

• Refactor
  • Improved internal precision handling for statistics calculations to support more accurate data analysis.

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[coderabbitai]

Walkthrough

Changes integer count types to floating-point types in two public structs (FieldStats and QueryRow) within the field statistics module, affecting how counts are represented and stored.

Changes

Cohort / File(s)	Summary
Type conversion in field statistics src/storage/field_stats.rs	Changed count fields from i64 to f64 in FieldStats struct (field_count, distinct_count, and values in distinct_values map) and QueryRow struct (field_count, distinct_count, distinct_value_count)

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~12 minutes

Poem

🐰 From whole counts to decimal precision,
The fields now measure with more decision,
Where integers once bounded tight,
Floats now dance in measured light,
More nuance in each statistic's sight! 📊

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The description lacks required sections from the template (Fixes #XXXX, goal description, key changes, and testing checklist) and is overly brief.	Include the issue number, detailed description of the goal and rationale, key changes made, and complete the provided checklist items.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately describes the main change: updating datatypes in FieldStats and QueryRow from i64 to f64.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing touches

• 📝 Generate docstrings

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