dialects: (snitch_stream) add repetition to stride pattern

[superlopuh]

Without the repeat setting when the last offset is 0, Snitch just fetches every time without caching the value, repeat avoids this.

CC @jorendumoulin @JosseVanDelm seems like more and more accelerator config! One of the things that's somewhat annoying is that we now have to defensively reset the repetition count, it would be great to avoid this eventually.

[JosseVanDelm]

@superlopuh this is exactly what accfg is useful for indeed!!! @AntonLydike also recently added a accfg.reset op that should be useful to reset required at the end of MLIRs scope.
Upstreaming accfg is going to take a while though in these holiday-filled (yay) days :(

[nazavode]

Beautiful.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.91%. Comparing base (cc704e0) to head (8df3d31).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2927   +/-   ##
=======================================
  Coverage   89.90%   89.91%           
=======================================
  Files         405      405           
  Lines       50562    50574   +12     
  Branches     7818     7820    +2     
=======================================
+ Hits        45458    45473   +15     
+ Misses       3869     3867    -2     
+ Partials     1235     1234    -1     

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