API: Add BPF capabilities utility

[jpsamaroo]

This makes it possible to use privileged BPF features without running as root, assuming Julia's executable file or process has the appropriate capabilities.

Todo:

• Add bpf-exec utility to contrib/
• Attempt to set capabilities automatically during tests
• Check for appropriate capabilities in CI root tests
• Add CAP_NET_ADMIN
• Use CBinding to get constants and functions

[codecov-commenter]

Codecov Report

Base: 0.00% // Head: 0.00% // No change to project coverage 👍

Coverage data is based on head (6a30ed7) compared to base (89e9e6b).
Patch coverage: 0.00% of modified lines in pull request are covered.

Additional details and impacted files

@@          Coverage Diff           @@
##           master     #39   +/-   ##
======================================
  Coverage    0.00%   0.00%           
======================================
  Files          20      21    +1     
  Lines        1023    1030    +7     
======================================
- Misses       1023    1030    +7     

Impacted Files	Coverage Δ
src/BPFnative.jl	0.00% <ø> (ø)
src/libcap.jl	0.00% <0.00%> (ø)

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