Refactor - Moves config flags into executable capabilities

[Lichtso]

Makes the SBPF version selectable per executable, instead of per loader.

Replaces:

• Config::dynamic_stack_frames
• Config::enable_sdiv
• Config::static_syscalls
• Config::enable_elf_vaddr
• Config::reject_rodata_stack_overlap

With Config::enable_sbpf_v1 and Config::enable_sbpf_v2.

[codecov-commenter]

Codecov Report

Merging #473 (e96e757) into main (f91d598) will increase coverage by 0.15%.
The diff coverage is 95.53%.

@@            Coverage Diff             @@
##             main     #473      +/-   ##
==========================================
+ Coverage   89.65%   89.81%   +0.15%     
==========================================
  Files          23       23              
  Lines        9989    10195     +206     
==========================================
+ Hits         8956     9157     +201     
- Misses       1033     1038       +5     

Impacted Files	Coverage Δ
src/ebpf.rs	79.59% <ø> (ø)
src/syscalls.rs	98.49% <ø> (ø)
test_utils/src/lib.rs	96.15% <75.00%> (+0.15%)	⬆️
src/elf.rs	89.25% <92.22%> (+0.27%)	⬆️
src/assembler.rs	99.61% <100.00%> (+0.01%)	⬆️
src/disassembler.rs	93.36% <100.00%> (+0.03%)	⬆️
src/interpreter.rs	97.89% <100.00%> (+0.30%)	⬆️
src/jit.rs	92.78% <100.00%> (+0.08%)	⬆️
src/memory_region.rs	94.01% <100.00%> (+0.38%)	⬆️
src/static_analysis.rs	66.27% <100.00%> (+0.03%)	⬆️
... and 2 more

[alessandrod]

Wouldn't it be better if this was

#[deive(Copy, Clone, Debug, Eq, PartialEq, Ord, PartialOrd)]
enum SbpfVersion {
	V1 = 1,
	V2 = 2,
	V3 = 3,
}

impl SbpfVersion {
	fn has_static_syscalls(&self) -> bool {
		self >= SbpfVersion::V2
	}

	fn allows_elf_virtual_addresses(&self) -> bool { ... }

	...
}

Then in the call sites it would be obvious from the has_* name what's being
checked for, and we wouldn't have to go and edit call sites if we flip things on
and off across versions.