Feature flags performance improvements

[robert-smartbear]

Goal

Reduce the time it takes to add a feature flag

Design

Currently feature flags are stored in the same file as metadata which means that each time a feature flag is added, all that data has to be sanitized and saved. By saving the feature flags into separate files we reduce the processing required significantly.

Changeset

Removed the feature flags from metadata object and created a separate file store for them.

Testing

E2E tests

[github-actions]

Bugsnag.framework binary size increased by 12,992 bytes from 656,120 to 669,112

    FILE SIZE        VM SIZE    
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  +2.2%    +196  +1.2%    +220    [8 Others]
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  +4.9%     +80  +4.9%     +80    Function Start Addresses
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  [ = ]       0 -83.1% -12.7Ki    [__LINKEDIT]
  +2.0% +12.7Ki  [ = ]       0    TOTAL

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