add localtileserver library dep

[emmalu]

Summary:

What did I do?

• Added localtileserver as library to install in requirements.txt Why *** did I do it? (What was the motivation?)
• This package is necessary for upcoming local raster visualization How *** can someone test or demo my changes?
• Upgrade library in the ADE and test (new) local raster visualization by code demo

Checklist before requesting a review:

• [ ] My code follows the guidelines of this project
• [ ] I performed a self-review of my code changes
• [ ] I have added my changes to the change log (HISTORY.rst)
• [ ] I have completed spell-checking, removed unnecessary print statements & commented-out code
• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation
• [ ] New and existing unit tests pass locally with my changes