feat(snowflake): create an ibis backend from a snowpark session

[cpcloud]

Add a from_snowpark method to Snowflake backend. cc @IndexSeek.

[cpcloud]

Here's the entire test suite run from an Ibis Snowflake backend initialized from a Snowpark connection:

…/ibis on  ibis-from-snowpark is 📦 v8.0.0 via 🐍 v3.11.8 via ❄️   impure (ibis-3.11.8-env)
❯ pytest -m snowflake -n 8 --dist loadgroup --snapshot-update -q -x
bringing up nodes...
.xx..........................x.........x.........x....x......x...............x........x....x..x.............x......x......x....x..x.x......xxxxxxxxxxxx....x..x........x......xx.x......x.. [ 11%]
.x.....x..x....x.x..x...........x......x.x...x..xxxxxxxx.xx.x.x....x.xxx..x..x..............x..........s................x.......s..........s......................s...................s.... [ 22%]
.........................................................x...x..x........x..x......x...xx.x........x...x..x.......xx...x..........................x.xx.........x......xxx.................. [ 34%]
...x.....x...x...x........................x..................x...................x............................x...................x.........x.....xx.x.......x...x..x..xx..x.....x......... [ 45%]
....x.x....................x......x..x..x..xx..xx..xxxxx......xxx.xxx.x....xxxx.xxx.xxx....xx.xx.xxxxx.xxxxx...xxxxxxxx..xxxx.xxxx.x..x....xx..x..x.................x...................... [ 56%]
.......x..............x......x.xx..................x....x......x..........................x..xx...x..............................................x....xx................................... [ 68%]
x.................................x..x........x........................x..x.x...xxx...x.........x.x.......................x.......x.x......x..............x......x..x....x....xx........... [ 79%]
......x........x.....................x..x..x.........x.x..x....x...............x.......x.s..............x....x..............x....x........x....x.............................s............. [ 90%]
.......................................................................................................................................................                                     [100%]
1408 passed, 7 skipped, 232 xfailed in 145.30s (0:02:25)

[IndexSeek]

This is going to be great for interoperability! 🎉

Thank you for working on this, I'm looking forward to giving it a try.