feat: add math/base/special/sincosdf

[ByteKnight28]

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Resolves a part of #649 .

Description

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This pull request:

• Adds math/base/special/sincosdf

Related Issues

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This pull request has the following related issues:

• [RFC]: Add C implementations to base special math functions (tracking issue) #649

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[Planeshifter]

Thanks for your first PR! Left initial comments.

[Planeshifter]

This test case is a duplicate of the one starting at line 49 - both test mediumNegative data with the same description 'the function computes the sine and cosine (for -256*180.0 < x < 0)'.

This should likely test mediumPositive instead, similar to how test.main.js has four distinct test blocks covering medium negative, medium positive, large negative, and large positive ranges.

[Planeshifter]

This file should use tryRequire with a skip option to gracefully handle the case when the native addon isn't built.

Compare with the reference at sincos/test/test.native.js which uses:

var resolve = require( 'path' ).resolve;
var tryRequire = require( '@stdlib/utils/try-require' );

var sincosdf = tryRequire( resolve( __dirname, './../lib/native.js' ) );
var opts = {
    'skip': ( sincosdf instanceof Error )
};

tape( 'main export is a function', opts, function test( t ) {
    // ...
});

[ByteKnight28]

Thanks for the review! I’ll update the test to use tryRequire with the skip option, following the pattern from sincos/test/test.native.js, so it gracefully handles the case when the native addon isn’t built.
Will push the fixes shortly. Appreciate the guidance!

[Planeshifter]

Missing @example tags in the JSDoc. E.g.,

* @example
* var v = sincosdf( 0.0 );
* // returns [ 0.0, 1.0 ]
*
* @example
* var v = sincosdf( 90.0 );
* // returns [ 1.0, ~0.0 ]
*
* @example
* var v = sincosdf( NaN );
* // returns [ NaN, NaN ]

[stdlib-bot]

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