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Add bilinear (2-D) and trilinear (3-D) LERP interpolators for regbin maps (#223)

* Add bilinear (2-D) and trilinear (3-D) LERP interpolators for regbin maps

Adds Map(method="LERP") support for 2-D and 3-D regular-binning maps.
Previously only IDW and NN were registered; LERP was 1-D only.

- appletree/interpolation.py: two new functions, both wrapped with @jit
    * map_interpolator_regular_binning_bilinear_2d
    * map_interpolator_regular_binning_trilinear_3d
  Each locates the lower-corner cell, blends sequentially along each axis,
  and clips corner indices so out-of-box queries snap to the nearest edge.

- appletree/config.py: register the new functions in
  Map._REGBIN_INTERPOLATORS under (2, "LERP") and (3, "LERP").

- tests/test_lerp_2d_3d.py: 8 new unit tests covering
    * exact reproduction of any linear function (the defining property of LERP)
    * exact value at every grid corner
    * cell-center value equals 4-corner / 8-corner mean
    * out-of-box clipping doesn't crash
    * LERP and IDW agree at corner points

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

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