[RFC]: add `array/base/linspace2d`

[kgryte]

Signature:

linspace2d( start, stop, shape, colexicographic )

Example usage:

var x = linspace2d( 0, 100, [ 2, 3 ], false );
// returns [ [ 0, 20, 40 ], [ 60, 80, 100 ] ]

x = linspace2d( 0, 100, [ 2, 3 ], true );
// returns [ [ 0, 40, 80 ], [ 20, 60, 100 ] ]

Time estimate without AI: 3hrs
Time estimate with AI: 2hrs

[headlessNode]

PR: stdlib-js/stdlib#5464
Time till opening PR: 1hr 18mins ( It took longer than this, due to an error from a change from another PR. But this time is when the implementation was ready. )
Loom recording: Link

[headlessNode]

Notes:

• It was a fairly simple function to implement. Nothing out of ordinary. With AI, I think, the time taken may have been reduced to 45 - 50mins tops.

• During self-review, Implemented some obvious optimizations. Time taken: 10-15mins