Split most of native symbolication into its own crate

[Swatinem]

This splits out most the native processing into the symbolicator-native crate.

Some things that are still in symbolicator-service but which might be better to split apart:

• The ObjectsActor: Ideally the data-cache would be in symbolicator-service, but all the logic and types around MetaCache should rather live in symbolicator-native.
• Related to the above, all the types dealing with candidates are purely a native concern.
• The RawObjectInfo and related structs. Not quite sure why we reused those for JS processing.

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[codecov[bot]]

Codecov Report

Merging #1324 (28c85a3) into master (75db4ae) will decrease coverage by 0.01%. The diff coverage is 83.67%.

:exclamation: Current head 28c85a3 differs from pull request most recent head a9d835f. Consider uploading reports for the commit a9d835f to get more accurate results

@@            Coverage Diff             @@
##           master    #1324      +/-   ##
==========================================
- Coverage   75.71%   75.70%   -0.01%     
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  Files          94       99       +5     
  Lines       14727    14727              
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- Hits        11150    11149       -1     
- Misses       3577     3578       +1