Add support for dependency relationships for alpine (apk) (#1063)

* Fix type of pull deps and add support for provides

Signed-off-by: Dan Luhring <dan+github@luhrings.com>

* [wip] apk dependency lookup

Signed-off-by: Alex Goodman <alex.goodman@anchore.com>

* update whitespace for linter

Signed-off-by: Christopher Phillips <christopher.phillips@anchore.com>

* adjust test conditions

Signed-off-by: Timothy Gerla <tim@gerla.net>

* fix TODOs and improve Provides parser

* run simports after main merge

Signed-off-by: Christopher Phillips <christopher.phillips@anchore.com>

* add tests to cover apk relationship parsing cases

Signed-off-by: Alex Goodman <alex.goodman@anchore.com>

* generate JSON schema for breaking changes to apk metadata

Signed-off-by: Alex Goodman <alex.goodman@anchore.com>

* update tests to account for additional dependencies

Signed-off-by: Alex Goodman <alex.goodman@anchore.com>

* [wip] fix relationship encoding for cyclonedx

Signed-off-by: Alex Goodman <alex.goodman@anchore.com>

* simplify package relationships that can be expressed

Signed-off-by: Alex Goodman <alex.goodman@anchore.com>

Signed-off-by: Dan Luhring <dan+github@luhrings.com>
Signed-off-by: Alex Goodman <alex.goodman@anchore.com>
Signed-off-by: Christopher Phillips <christopher.phillips@anchore.com>
Signed-off-by: Timothy Gerla <tim@gerla.net>
Co-authored-by: Alex Goodman <alex.goodman@anchore.com>
Co-authored-by: Christopher Phillips <christopher.phillips@anchore.com>
Co-authored-by: Timothy Gerla <tim@gerla.net>

schema/json/schema-5.0.0.json

@@ -1571,4 +1571,4 @@
       "type": "object"
     }
   }
-}
+}