[feat] add lib/stats for statistics, add FloatOrIntList to types

[hyorigo]

• draft from hashlib
• boring
• float list
• add tests for types
• add more cases
• for checks~
• floats
• for modules
• good
• for f64data
• list a few methods
• for sample

[codacy-production[bot]]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
:white_check_mark: +0.20% (target: -1.00%)	:white_check_mark: 100.00%

Coverage variation details

| | Coverable lines | Covered lines | Coverage | | ------------- | ------------- | ------------- | ------------- | | Common ancestor commit (d2155e105a9163c689fd56545ac6485e06d8ba51) | 5048 | 4717 | 93.44% | | | Head commit (f91da02c170b60f9fbc1205916f9e43084d988c8) | 5209 (+161) | 4878 (+161) | 93.65% (**+0.20%**) | **Coverage variation** is the difference between the coverage for the head and common ancestor commits of the pull request branch: ` - `

Diff coverage details

| | Coverable lines | Covered lines | Diff coverage | | ------------- | ------------- | ------------- | ------------- | | Pull request (#116) | 161 | 161 | **100.00%** | **Diff coverage** is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: `/ * 100%`

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 91.47%. Comparing base (d2155e1) to head (f91da02).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #116 +/- ## ========================================== + Coverage 91.20% 91.47% +0.27% ========================================== Files 41 42 +1 Lines 4900 5058 +158 ========================================== + Hits 4469 4627 +158 Misses 325 325 Partials 106 106 ```

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