feat: add url_download/url_upload as sql function

[frankliee]

Currently, download_url/upload_url only support DataFrame API, this PR adds download_url/upload_url to sql, which could be used for image processing demo.

df = daft.from_pydict({"urls": [
    "https://user-images.githubusercontent.com/17691182/190476440-28f29e87-8e3b-41c4-9c28-e112e595f558.png",
    "https://user-images.githubusercontent.com/17691182/190476440-28f29e87-8e3b-41c4-9c28-e112e595f558.png",
    "https://user-images.githubusercontent.com/17691182/190476440-28f29e87-8e3b-41c4-9c28-e112e595f558.png",
]})
df = daft.sql("SELECT image_decode(url_download(urls)) FROM df")
df.show()

[codspeed-hq]

CodSpeed Performance Report

Merging #3575 will degrade performances by 19.68%

_{Comparing frankliee:sql-url (655307a) with main (95a61d2)}

Summary

❌ 1 regressions
✅ 26 untouched benchmarks

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Benchmarks breakdown

	Benchmark	main	frankliee:sql-url	Change
❌	test_iter_rows_first_row[100 Small Files]	232.2 ms	289.1 ms	-19.68%

[codecov]

Codecov Report

Attention: Patch coverage is 55.55556% with 52 lines in your changes missing coverage. Please review.

Project coverage is 77.76%. Comparing base (95a61d2) to head (655307a).

Files with missing lines	Patch %	Lines
src/daft-sql/src/modules/url.rs	55.17%	52 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3575      +/-   ##
==========================================
- Coverage   77.79%   77.76%   -0.04%     
==========================================
  Files         716      717       +1     
  Lines       87989    88106     +117     
==========================================
+ Hits        68451    68515      +64     
- Misses      19538    19591      +53     

Files with missing lines	Coverage Δ
src/daft-functions/src/uri/download.rs	83.46% <ø> (ø)
src/daft-functions/src/uri/mod.rs	100.00% <ø> (ø)
src/daft-functions/src/uri/upload.rs	65.24% <ø> (+0.60%)	⬆️
src/daft-sql/src/functions.rs	81.85% <100.00%> (+0.08%)	⬆️
src/daft-sql/src/modules/url.rs	55.17% <55.17%> (ø)

... and 2 files with indirect coverage changes

[jaychia]

@andrewgazelka could you help get this through?