Add malloc_chunk command tests for heuristic heap

[CptGibbon]

The same tests applied to the malloc_chunk command, but with set resolve-heap-via-heuristic on.

Personally I don't like how Black has broken the visual flow here for the sake of a couple of characters.

[codecov-commenter]

Codecov Report

Merging #1234 (2c95f0d) into dev (0237c1d) will increase coverage by 1.00%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##              dev    #1234      +/-   ##
==========================================
+ Coverage   53.72%   54.72%   +1.00%     
==========================================
  Files         179      179              
  Lines       20131    20172      +41     
  Branches     1836     1848      +12     
==========================================
+ Hits        10815    11040     +225     
+ Misses       8901     8687     -214     
- Partials      415      445      +30     

Impacted Files	Coverage Δ
tests/test_heap.py	95.83% <100.00%> (+2.50%)	⬆️
pwndbg/commands/misc.py	79.72% <0.00%> (-8.41%)	⬇️
tests/utils.py	92.59% <0.00%> (ø)
tests/test_misc.py	100.00% <0.00%> (ø)
pwndbg/commands/__init__.py	67.71% <0.00%> (+0.14%)	⬆️
pwndbg/commands/heap.py	65.50% <0.00%> (+0.27%)	⬆️
pwndbg/disasm/__init__.py	59.58% <0.00%> (+0.68%)	⬆️
pwndbg/symbol.py	44.13% <0.00%> (+1.11%)	⬆️
pwndbg/gdblib/regs.py	65.78% <0.00%> (+1.31%)	⬆️
pwndbg/gdblib/prompt.py	53.06% <0.00%> (+1.99%)	⬆️
... and 7 more

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[gsingh93]

I think it would be better to pull out the common code from test_malloc_chunk_command and test_malloc_chunk_command_heuristic into another function, and then in both we can just set the necessary config options and call that common function.

[gsingh93]

Another way to simplify both tests:

    chunks = {}
    results = {}
    for name in ['allocated', 'tcache', 'fast', 'small', 'large', 'unsorted']:
        chunks[name] = pwndbg.heap.current.malloc_chunk(
            gdb.lookup_symbol("%s_chunk" % name)[0].value()
        )

        results[name] = gdb.execute("malloc_chunk %s_chunk" % name, to_string=True).splitlines()

[gsingh93]

Looks much better, thanks!