Do not use copied autogenerated files for x/sequencer

[mtsitrin]

as in #1078 , we need same solution for the x/sequencer module

currently, it seems blocked due to (by @keruch ):

i tried to actually but haven't managed.. one of messages in x/sequncer uses proto.Any. when i generated proto, the Any field had type proto.Any while we need sdk.Any. in theory, i needed to add some cosmos-specific plugins to buf, but that didn't work for some reason, maybe i did smth wrong. overall, i think we just need to update dymint to 0.47 and import the hub without all this stuff with proto generators.