Allow setting direction (RTL or LTR)

React-window grids have a 'direction' prop, which allow them to be used in a left-to-right context.

However, react-base-table doesn't expose this prop and always sets the direction to 'ltr on the grid'.

Would it be possible to expose the direction property in react-base-table?

Start by tracing how react-base-table configures its grid and currently fixes the direction to ltr. Identify the public component entry point and existing tests for grid properties, then verify that both RTL and LTR values are accepted and applied consistently.

Written by the indexing model from the issue text.