Renaming ports and signals to ensure a consistent naming convention

[ptpan]

This PR implements the following signal and port name changes to ensure a consistent naming convention:

• [ ] reqstream/respstream -> req/rsp
• [ ] reset -> rst
• [ ] req/resp -> req/rsp

With this PR, we will be using three-letter names across important ports/signals: clk, rst, val, rdy, req, rsp.

[codecov[bot]]

Codecov Report

Attention: 15 lines in your changes are missing coverage. Please review.

Comparison is base (6da7397) 90.27% compared to head (72f1807) 89.82%.

:exclamation: Current head 72f1807 differs from pull request most recent head e6c2253. Consider uploading reports for the commit e6c2253 to get more accurate results

Files	Patch %	Lines
pymtl3/stdlib/mem/MemRequesterAdapterFL.py	0.00%	7 Missing :warning:
pymtl3/stdlib/xcel/XcelRequesterAdapterFL.py	0.00%	7 Missing :warning:
pymtl3/stdlib/reqresp/ifcs/ifcs.py	83.33%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## pp482-ece4750-2022-changes #261 +/- ## ============================================================== - Coverage 90.27% 89.82% -0.45% ============================================================== Files 317 317 Lines 29199 28222 -977 ============================================================== - Hits 26358 25350 -1008 - Misses 2841 2872 +31 ```

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