ref(pallet-ud-accounts): big simplification of the pallet design

approved this merge request

requested review from @tuxmain

@tuxmain you can review if you have time within 12 hours, otherwise I will merge anyway because I am very confident about this change.

approved this merge request

added 2 commits

• 4e23c324 - 1 commit from branch master
• eedb2c52 - ref(pallet-ud-accounts): big simplification of the pallet design

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enabled an automatic merge when the pipeline for eedb2c52 succeeds

merged