[issue32831] IDLE: Add docstrings and tests for codecontext

[Terry J. Reedy]

Terry J. Reedy <tjreedy at udel.edu> added the comment:

After this is merged, we should immediately add 'async' to the list of block openers.

With complete tests, we can more confidently cleanup the code a bit, as well as change behavior.  The fourth field of info tuples, block keyword, is never used as part of info tuples.  (It is used before being added in get_context.)

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versions: +Python 3.6, Python 3.7

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