feat: add implementation of stats/strided/diqrsorted

[Om-A-osc]

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Resolves #NA

Description

What is the purpose of this pull request?

This pull request:

• adds an implementation of @stdlib/stats/strided/diqrsorted
• computes the interquartile range (IQR) for sorted double-precision
  floating-point strided arrays
• leverages the existing dmediansorted implementation to compute
  the first and third quartiles, ensuring numerical correctness and
  consistency with existing sorted statistics utilities
• provides both main and .ndarray interfaces following stdlib
  strided API conventions
• includes comprehensive unit tests covering edge cases, stride,
  negative stride, and offset semantics
• adds benchmarks for performance evaluation
• includes a C implementation and corresponding examples to maintain
  parity with other strided statistical routines
• adds REPL help, documentation, and examples
• follows stdlib formatting, linting, and code style guidelines

This addition extends the sorted statistics utilities by providing a
robust and efficient measure of statistical dispersion.

Related Issues

Does this pull request have any related issues?

This pull request has the following related issues:

• NA

Questions

Any questions for reviewers of this pull request?

No.

Other

Any other information relevant to this pull request? This may include screenshots, references, and/or implementation notes.

Implementation notes:

• The implementation assumes the input array is already sorted.
• Quartiles are computed using the median-of-halves approach,
  consistent with common statistical definitions and boxplot usage.
• Reusing dmediansorted reduces duplication and ensures
  consistency with existing sorted median behavior.

Checklist

Please ensure the following tasks are completed before submitting this pull request.

• Read, understood, and followed the contributing guidelines.

AI Assistance

When authoring the changes proposed in this PR, did you use any kind of AI assistance?

• Yes
• No

Disclosure

N/A

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@stdlib-js/reviewers

[stdlib-bot]

Coverage Report

Package	Statements	Branches	Functions	Lines
stats/strided/diqrsorted	$\color{green}314/314$ $\color{green}+100.00%$	$\color{green}17/17$ $\color{green}+100.00%$	$\color{green}4/4$ $\color{green}+100.00%$	$\color{green}314/314$ $\color{green}+100.00%$

The above coverage report was generated for the changes in this PR.