Add smoke test

[gsingh93]

Add a smoke test that runs every command to make sure that no errors are thrown. This catches the bug in #1111. The test is currently skipped because it can be flaky, but until we improve it we can at least run it locally while developing.

We run the commands right after starti and without passing in any additional args. In the future we can improve this by getting the argparser object for the command and generating some default arguments.

We skip running shell commands, as those don't really need testing, and running all of those commands on a user's system could lead to issues. Some of them wait on user input as well, which blocks the test.

A few additional commands needed to be removed, mostly because they either blocked waiting for user input, or just took too long executing every instruction. errno and try_free seem to be throwing legitimate errors, so for now they're added to this list but should be fixed eventually.

Finally, there was a strange issue where start_binary itself was throwing exceptions when it was calling starti, but the exception was just "Warning:". Some commands randomly threw a few additional exceptions, all seem to be related to accessing memory or setting a breakpoint at address 0x318 (at least on my system). For now I've whitelisted these exceptions, but they should eventually be removed.

[codecov-commenter]

Codecov Report

Merging #1113 (9e195c9) into dev (099c766) will increase coverage by 0.01%.
The diff coverage is 48.38%.

@@            Coverage Diff             @@
##              dev    #1113      +/-   ##
==========================================
+ Coverage   50.11%   50.13%   +0.01%     
==========================================
  Files         161      162       +1     
  Lines       19685    19714      +29     
  Branches     1791     1796       +5     
==========================================
+ Hits         9866     9884      +18     
- Misses       9484     9496      +12     
+ Partials      335      334       -1     

Impacted Files	Coverage Δ
tests/test_commands.py	42.85% <42.85%> (ø)
pwndbg/commands/shell.py	70.83% <100.00%> (ø)
tests/conftest.py	100.00% <100.00%> (ø)
pwndbg/config.py	78.03% <0.00%> (+2.27%)	⬆️
pwndbg/exception.py	55.55% <0.00%> (+4.44%)	⬆️

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