Notice: Bug in default_ctx / scope_ctx with IPykernel < 6

[ihnorton]

We added tiledb.scope_ctx and changed tiledb.default_ctx implementation to use ContextVar (#563). However, there are bugs in the ContextVar support in IPykernel before version 6: https://github.com/ipython/ipykernel/issues/494.

Therefore, we now print a warning when scope_ctx or default_ctx are used with IPykernel < 6: #665

This issue serves as a placeholder which will be linked from the warning in order to provide background explanation and any updates if needed.

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ch7578