WIP: Add python bindings

[vthib]

Add a new crate to expose python bindings. This will attempt to match the yara API as much as possible to ease migration.

Most of the bindings have been implemented. A few features are missing in boreal to be able to match the yara API, and a few things need to be fixed. This will be done in following PRs.

[codecov]

Codecov Report

Attention: Patch coverage is 99.75962% with 1 line in your changes missing coverage. Please review.

Project coverage is 98.43%. Comparing base (68ee69b) to head (0ae645e).
Report is 18 commits behind head on master.

Files with missing lines	Patch %	Lines
boreal-py/src/lib.rs	99.29%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #182      +/-   ##
==========================================
- Coverage   98.55%   98.43%   -0.12%     
==========================================
  Files          81       87       +6     
  Lines       24612    25048     +436     
==========================================
+ Hits        24257    24657     +400     
- Misses        355      391      +36     

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