Slang-netlist: handle variable declrations in procedural blocks

[jameshanlon]

FIxes #1007.

Will need to be rebased once #1014 lands.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 94.22%. Comparing base (895805e) to head (0793845). Report is 2 commits behind head on master.

:exclamation: Current head 0793845 differs from pull request most recent head 1cb500e

Please upload reports for the commit 1cb500e to get more accurate results.

Additional details and impacted files

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