Rename rerun-sdk[datafusion] to rerun-sdk[dataplatform] and add pandas dependency

### Related

- closes
https://linear.app/rerun/issue/RR-3532/pyarrow-needs-pandas-for-nanosecond-resolution
- related
https://linear.app/rerun/issue/RR-3786/remove-the-pandas-dependency

### What

Title. The reason for that is that pyarrow soft-depends on pandas to
properly handle nanosecond timestamps (see RR-3532 for details).

Renamed the extra to `dataplatform` because is just makes more sense.
The `datafusion` extra is kept for backward compatibility.

Source-Ref: 1cd0e1d0ab8d457c7663eeec90e3d390a99eba4a

Author: abey79

docs/content/overview/installing-rerun/python.md

@@ -8,9 +8,13 @@ The Python SDK includes both the SDK and the Viewer, so you're ready to go with
 -   `pip install rerun-sdk` via pip
 -   `conda install -c conda-forge rerun-sdk` via Conda
 
+<!-- NOLINT_START -->
+
 Conda always comes with support for all features but if using pip you may need to specify optional features:
 -   `pip install rerun-sdk[notebook]` for the embedded notebook tools
--   `pip install rerun-sdk[datafusion]` for the query api tools
+-   `pip install rerun-sdk[dataplatform]` for the query api tools
+
+<!-- NOLINT_END -->
 
 ## Next steps
 

rerun_py/pyproject.toml

@@ -38,6 +38,7 @@ text = "MIT OR Apache-2.0"
 tests = [
   "inline-snapshot==0.31.1",
   "opencv-python>4.6",
+  "pandas>=2",
   "polars==1.36.1",
   "pytest==8.4.2",
   "semver>=3.0,<3.1",
@@ -47,7 +48,12 @@ tests = [
   "datafusion==50.1.0",
 ]
 notebook = ["rerun-notebook==0.30.0-alpha.1+dev"]
-datafusion = ["datafusion==50.1.0"]
+# TODO(RR-3786): when pyarrow is fixed, we should remove the pandas dependency
+datafusion = ["datafusion==50.1.0", "pandas>=2"] # deprecated, replaced by `dataplatform` (NOLINT)
+dataplatform = [ # NOLINT
+  "datafusion==50.1.0",
+  "pandas>=2",
+] # pandas is needed so pyarrow properly converts nanoseconds (RR-3532)
 # Note: We avoid self-referential extras like "rerun-sdk[notebook]" because they cause
 # uv to fetch rerun-sdk from PyPI when the local package isn't built yet.
 all = ["rerun-notebook==0.28.0-alpha.1+dev", "datafusion==50.1.0"]