Improve the API of ui.table

[falkoschindler]

This PR attempts to

• improve the API for adding and removing rows (see API difference ui.table inbetween add_rows()+remove_rows() vs update_rows() #2633)
• support inferring columns from the first row
• allow updating a dataframe
• support default column parameters

Most features are inspired by PR #3263, which - unfortunately - introduces a nasty breaking change, because updating rows and columns passed to the initializer cannot be recognized anymore. In contrast to PR #3263, this PR probably won't replace the from_pandas method, because the way it introduces default column parameters won't further blow up the from_pandas API.

Strictly speaking, this new PR doesn't cause any breaking changes. But because it deprecates the current API for adding and removing rows, it targets the 2.0 milestone.

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Open tasks:

• create/update table from dataframe and a list of (default) columns
• support passing default column parameters only and derive column definitions from rows or dataframe