fix(datetime): $d supports key format object (#1502)

[horitaka]

This PR is a fix for the issue #1502.

What was fixed

• $d supports key format object like $n

How it was fixed

• Add a new logic to parse the $d parameter and handled it as options for Intl.DateTimeFormat. The logic is the same as $n.
• Add a new test case for key format object.

Result

$d(datetime, {year: '2-digit'}) returns correct value.

[kazupon]

Thank you for your contribution!
That's a great contribution!

Thank you so much!

[majdkhasib]

I think this misses these options

timeZone: 'Asia/Shanghai',
// Force 12-hour or 24-hour
hour12: true | false,

// Rarely-used options
hourCycle: 'h11' | 'h12' | 'h23' | 'h24',
formatMatcher: 'basic' | 'best fit'

[horitaka]

@majdkhasib Sorry for missing some options... and thank you for your fix commit!