A few more small, instructive examples

[BrettWitty]

What problem does this solve or what need does it fill?

A number of small examples to demonstrate the library just a bit further for newbies. It also will demonstrate your suggested solution to some common problems.

Describe the solution would you like?

Example code for the following situations:

• Scrolling map: Something like the random_dungeon.rs, but for a map that is larger than 1 screen. Scrolling could be discrete or continuous.
• Tinting: Tint the map between a few colours.
• Scaling tiles uniformly: 16x16 tiles being presented as 32x32.
• Zooming: Scaling the map in and out.
• Benchmarks: Demonstrating the impact of dense vs sparse layers, or sizes of chunks (too big vs too small)

Describe the alternative(s) you've considered?

I have trouble finding other people's code using bevy_tilemap.

[joshuajbouw]

Thanks for the added example suggestions!