Allow embed timestamp to be Date in typings

[oathompsonjones]

Type should be string | Date in order to allow for doing timestamp: new Date()

[Skillz4Killz]

I think this PR is fine, but fair warning this could be considered a breaking change. Since it was accepting string before, it would not accept the Date option so most devs probably opted to do something like what I have

new Date(time).toISOString()

Im pretty sure this would break on compile time because you cant set a string to a Date. Will need testing when im able to do so

[Skillz4Killz]

Please, can we consider rewinding this back to the original commit of Date | string? I am certain I am not the only dev who was probably sending strings instead of Date. Here is how many errors I got from this change.

I believe the best type would be Date | string

[Skillz4Killz]

It's perfect. Slight modification to Date | string to have a Strict => Loose typings format would be nicer on the eyes imo.

[DonovanDMC]

I have always used new Date().toISOString(), making it take only a Date object would break literally every single one of my projects, thousands of files total (yes, I see that it has been changed back)