Add amp option wp cli command to manage plugin options

[thelovekesh]

Summary

Fixes #5783
Previously #7368

Checklist

• My code is tested and passes existing tests.
• My code follows the Engineering Guidelines (updates are often made to the guidelines, check it out periodically).

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[westonruter]

Just pulling in this previous PR review: #7368 (review)

[westonruter]

Code looks good! Just a few more bits of feedback.

[westonruter]

Why was this specific cast needed? Is it because it is a string and the following logic requires it to be an int:

amp-wp/src/Sandboxing.php

Lines 123 to 129 in c28b8f1

	if (
	isset( $new_options[ Option::SANDBOXING_LEVEL ] )
	&&
	in_array( $new_options[ Option::SANDBOXING_LEVEL ], self::LEVELS, true )
	) {
	$options[ Option::SANDBOXING_LEVEL ] = $new_options[ Option::SANDBOXING_LEVEL ];
	}

It seems like the Sandboxing service should be doing that cast to int as well, since it is already doing so for bool:

amp-wp/src/Sandboxing.php

Lines 120 to 122 in c28b8f1

	if ( isset( $new_options[ Option::SANDBOXING_ENABLED ] ) ) {
	$options[ Option::SANDBOXING_ENABLED ] = (bool) $new_options[ Option::SANDBOXING_ENABLED ];
	}

[thelovekesh]

I believe when we update options using REST API then it first validates the options(and return any validation failures) through provided schema. In the case of '0' and '1' and 'true' and 'false' with schema type as boolean, it runs it through the rest_sanitize_boolean first hence type cast is not required but in the case of enums it fails:

amp-wp/src/Sandboxing.php

Line 56 in c28b8f1

const LEVELS = [ 1, 2, 3 ];

amp-wp/src/Sandboxing.php

Lines 68 to 72 in c28b8f1

	Option::SANDBOXING_LEVEL => [
	'type' => 'int',
	'enum' => self::LEVELS,
	'default' => 1,
	],

In other words, it doesn't reach here:

amp-wp/includes/options/class-amp-options-manager.php

Line 368 in c28b8f1

$options = apply_filters( 'amp_options_updating', $options, $new_options );

---

It seems like the Sandboxing service should be doing that cast to int as well since it is already doing so for bool:

Type cast here is done by REST schema's rest_sanitize_boolean IMO.