feat(Stats): add Statistics BoxSource

[XiaoXiaoSN]

Box Source: Statistics (Calculate)

Adds the Statistics box source to Magic Box. It is disabled by default.

Details:

• Category (Kind): Calculate
• Tag: #
• Default Input: 2, 4, 4, 4, 5, 5, 7, 9 ::stats

Options:

• ::statistics, ::stats

Description:

Descriptive statistics (mean, median, mode, stddev, etc.) of a list of numbers.

Usage Examples:

• Input:

2, 4, 4, 4, 5, 5, 7, 9 ::stats

• Output Box (Statistics):

Count: 8
Sum: 40
Mean: 5
Median: 4.5
Mode: 4
Min: 2
Max: 9
Range: 7
Variance: 4
Std Dev (pop): 2
Std Dev (sample): 2.13809

[XiaoXiaoSN]

Linting/testing failed on this branch.

Error details:

Please fix the linting and testing issues and ensure 'bun run lint' and 'bun test run' pass.

[XiaoXiaoSN]

Linting failed because imports in src/modules/boxSources/index.ts are not sorted. Please run 'bun run lint:fix' or sort the imports to fix this.

[XiaoXiaoSN]

Rebased onto main and fixed import sorting / linting issues. All tests pass!