`FastBingTileGenerator` for significantly speeding up grid generation

[joshuacortez]

This PR adds a new gridding class FastBingTileGenerator that significantly speeds up grid generation. This is added in 00_grids.ipynb.

FastBingTileGenerator leverages the voxel traversal algorithm and the scanline fill algorithm to get all pixels given the vertices of a polygon. The utility functions for these algorithms are defined in 15_polygon_fill.ipynb with corresponding examples.

Reviewers should look at the ff notebooks

1. 00_grids.ipynb
2. 15_polygon_fill.ipynb
3. tutorial.grids.ipynb

Remaining To-dos:

• [x] Create tests for FastBingTileGenerator
• [x] Update documentation site
• [x] Updating Google Colab links

Feedback is appreciated!

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[joshuacortez]

Resolves #212 , #218 , #235