Added RespectASO engine in Itsyconnect

[kanyacine]

Hello,
I really love Itsyconnect. It's become my main way of dealing with App Store Connect, so thank you for the work you've put into it !

One thing I felt was missing was a way to do ASO research directly inside the app, so I put together a keyword-research feature based on RespectASO https://github.com/respectlytics/respectaso . With the AI layer already in the app, it makes for a pretty powerful combo, and I can see a bright future for it.

I wanted to do a PR but first I'm not sure it will feat your idea of Itsyconnect and you just switch the license to MIT and i don't think it's compatible with RespectAso AGPL-3 license without being a big headache. Tell me if you still want it ! I'm not a developper, everything was done by claude but i made sure to ask him to follow the contributing guideline.

On each keyword section I've added the overall opportunity (popularity vs difficulty, based on Apple Itunes API and the algorithm of RespectASO) score of each word in his label, along with the Keyword mix (How the keyword for the field break down by popularity vs difficulty profile) and the Rank mix (where the app rank in search result for each keyword for the field)

Added a summary of the app for each storefront, (the download estimation are only calibrated for usa)

If you click on a keyword you have a complete analyze of it (based on the respectaso metrics) :

And you can do keyword search on each storefront :