Rename URL operation sniff() -> stat()

[mih]

This should be more commonly understood.

Closes #219

[codecov]

Codecov Report

Base: 89.48% // Head: 89.48% // No change to project coverage 👍

Coverage data is based on head (c73a12e) compared to base (ee46bc4).
Patch coverage: 76.92% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #231   +/-   ##
=======================================
  Coverage   89.48%   89.48%           
=======================================
  Files          74       74           
  Lines        6857     6857           
=======================================
  Hits         6136     6136           
  Misses        721      721           

Impacted Files	Coverage Δ
datalad_next/url_operations/tests/test_ssh.py	37.50% <0.00%> (ø)
datalad_next/url_operations/ssh.py	53.14% <50.00%> (ø)
datalad_next/annexremotes/uncurl.py	99.17% <100.00%> (ø)
datalad_next/url_operations/__init__.py	84.28% <100.00%> (ø)
datalad_next/url_operations/any.py	72.72% <100.00%> (ø)
datalad_next/url_operations/file.py	91.91% <100.00%> (ø)
datalad_next/url_operations/http.py	91.86% <100.00%> (ø)
datalad_next/url_operations/tests/test_any.py	100.00% <100.00%> (ø)
datalad_next/url_operations/tests/test_file.py	100.00% <100.00%> (ø)
datalad_next/url_operations/tests/test_http.py	58.27% <100.00%> (ø)

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