[issue39969] Remove Param expression context from AST

[Batuhan Taskaya]

New submission from Batuhan Taskaya <batuhanosmantaskaya at gmail.com>:

Param is an expression context that is no longer in use, we can simply remove it. This node predates the arguments node, and if I am not misguessing used inside of function signatures.

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components: Library (Lib)
messages: 364238
nosy: BTaskaya
priority: normal
severity: normal
status: open
title: Remove Param expression context from AST
versions: Python 3.9

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue39969>
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