Adds relative strength percentile to stocks/ta

[soggyomelette]

Description

Adds relative strength percentile to stocks/ta as requested in #2254

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[JerBouma]

Hi @soggyomelette,

Nice PR! Could you convert the "tickers" into a seperate table that a user can request with an optional argument? (and it won't show by default) It is now cut-off and you don't get much insights from it.

[JerBouma]

Looks good!