Add lonboard package

[scottyhq]

testing alternative to #522 ...

[github-actions]

👈 Try on Mybinder.org!

[pangeo-bot]

/condalock
Automatically locking new conda environment, building, and testing images...

[scottyhq]

trouble locking ml-notebook:

│  └─ lonboard [0.6.0|0.7.0|0.7.0b2|0.7.1] would require
│     └─ pyarrow >=14.0.1 , which can be installed (as previously explained);
└─ tensorflow >=2.14.0 *cuda118* is not installable because it requires
   └─ tensorflow-base [2.14.0 cuda118py310h2e5981e_0|2.14.0 cuda118py311h0476658_0|2.14.0 cuda118py39hbe86951_0], which requires
      ├─ libabseil >=20230125.3,<20230126.0a0 , which conflicts with any installable versions previously reported;
      └─ libgrpc >=1.54.3,<1.55.0a0 , which conflicts with any installable versions previously reported.

[weiji14]

trouble locking ml-notebook:

│  └─ lonboard [0.6.0|0.7.0|0.7.0b2|0.7.1] would require
│     └─ pyarrow >=14.0.1 , which can be installed (as previously explained);
└─ tensorflow >=2.14.0 *cuda118* is not installable because it requires
   └─ tensorflow-base [2.14.0 cuda118py310h2e5981e_0|2.14.0 cuda118py311h0476658_0|2.14.0 cuda118py39hbe86951_0], which requires
      ├─ libabseil >=20230125.3,<20230126.0a0 , which conflicts with any installable versions previously reported;
      └─ libgrpc >=1.54.3,<1.55.0a0 , which conflicts with any installable versions previously reported.

Yeah, the libgrpc conflicts looks like a similar issue to #489, which will be resolved once we can merge #514 (need to figure out how to make conda-lock happy).

[scottyhq]

/condalock

[weiji14]

Thanks @scottyhq, we can close #522 afterwards. I've been meaning to test lonboard on binder, but struggling because it doesn't have a lot of RAM. Will just hope that the lonboard <-> anywidget compatibility works 🤞