Support loading a dictionary for decompression

[handlerug]

Resolves: #8

[101arrowz]

Looks quite reasonable, will review more thoroughly and likely merge within a few days!

[Shane98c]

hi! we'd love to use this in icechunk-js. We'll need dict based decompression over there soon and this would let us keep using this library! A quick local test seemed to confirm this is working on my end.

[eeholmes-uw]

Hi! I am dropping in as we are using icechunk-js in https://github.com/d70-t/gridlook . Merging in this fix would allow icechunk-js to display icechunk stores that use compressions. Thanks!

[tylere]

Hi @101arrowz, checking to see if you will have time to review/merge this PR in the near future.
(context: I'm also interested in this to unblock icechunk visualizations.)

[Shane98c]

Found one little issue in this branch, but otherwise it appears to be working well for us! added the fix here @handlerug handlerug#1