Add webnn conv2d tests

[BruceDai]

@fdwr @Honry @huningxin @dontcallmedom PTAL, thanks.

[fdwr]

Too bad Javascript lacks a ??= operator.

      conv2dOptions.padding ??= options.padding;
      conv2dOptions.strides ??= options.strides;
      conv2dOptions.dilations ??= options.dilations;
      conv2dOptions.autoPad ??= options.autoPad;
      conv2dOptions.groups ??= options.groups;
      conv2dOptions.inputLayout ??= options.inputLayout;
      conv2dOptions.filterLayout ??= options.filterLayout;

Oh well. (no action expected, just musing)

[dontcallmedom]

unless I'm missing something, I think this could be accomplished with conv2dOptions = {...options};

[BruceDai]

I've updated. Please take another look, thanks @dontcallmedom

[fdwr]

unless I'm missing something, I think this could be accomplished with conv2dOptions = {...options};

Cool. I remember COBOL had a "MOVE CORRESPONDING" statement which would copy all fields from source to destination of the same name. So it's neat to see an equivalent in newer languages.

[fdwr]

Unsupported

[BruceDai]

Updated, thanks.

[fdwr]

I know you already read it above on lines 75 and 76, but it would be good to call it out here for clarity. e.g.

case 'oihw':
    // Just use the existing filterWidth and filterHeight above.
    break;

[BruceDai]

Added this 'oihw' case in switch block, thanks.

[fdwr]

That's a lot of work Bruce. You got all the primary cases. I'd just add one more with the combo of both dilations and strides that are greater than 1, because interesting bugs happen with the interaction of those two (at least, they have in the codebases I've worked on).

[BruceDai]

add one more with the combo of both dilations and strides that are greater than 1

Added such one test, PTAL, thanks.