SelectExtended: SearchBox improvements

[mightyvoodoo]

Hello there!

That would be nice if we could:

• Pass Func that allows to customize search logic
• Pass string placeholder for inner input

p.s.: Thanks for that nice package and all of your work 👍

[mckaragoz]

Fastest merged PR ever 🙂 Hope this is what you want about func and placeholder.

https://user-images.githubusercontent.com/78308169/221415263-053e9e30-78f2-4728-8604-fe2ac82ce347.mp4

And more good news, today we will release the feature with new version.

[mightyvoodoo]

@mckaragoz Just awesome, everything that was needed 💪

[mckaragoz]

v 6.3.0 is released. Please don't forget about breaking change, you should change script to min.js