Rename "provider" to "type" in an Identifier

[sschuberth]

Also see the related purl discussion at [1]. What we were meaning by
"provider" actually more resembles purl's "type".

[1] package-url/purl-spec#33

Signed-off-by: Sebastian Schuberth sebastian.schuberth@here.com

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This change is 

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Codecov Report

❗ No coverage uploaded for pull request base (master@4c86246). Click here to learn what that means.
The diff coverage is 76.66%.

@@            Coverage Diff            @@
##             master    #1088   +/-   ##
=========================================
  Coverage          ?   52.05%           
  Complexity        ?      298           
=========================================
  Files             ?      117           
  Lines             ?     5802           
  Branches          ?      844           
=========================================
  Hits              ?     3020           
  Misses            ?     2341           
  Partials          ?      441

Impacted Files	Coverage Δ	Complexity Δ
downloader/src/main/kotlin/Downloader.kt	32.06% <0%> (ø)	0 <0> (?)
cli/src/main/kotlin/commands/DownloaderCommand.kt	8.19% <0%> (ø)	1 <0> (?)
analyzer/src/main/kotlin/managers/Gradle.kt	82.79% <100%> (ø)	0 <0> (?)
analyzer/src/main/kotlin/PackageManager.kt	95.71% <100%> (ø)	0 <0> (?)
analyzer/src/main/kotlin/managers/PhpComposer.kt	74.6% <100%> (ø)	0 <0> (?)
analyzer/src/main/kotlin/managers/PIP.kt	68.87% <100%> (ø)	0 <0> (?)
analyzer/src/main/kotlin/managers/Stack.kt	85.8% <100%> (ø)	0 <0> (?)
analyzer/src/main/kotlin/MavenSupport.kt	79.03% <100%> (ø)	0 <0> (?)
analyzer/src/main/kotlin/managers/Maven.kt	67.94% <100%> (ø)	0 <0> (?)
analyzer/src/main/kotlin/managers/NPM.kt	82.4% <100%> (ø)	0 <0> (?)
... and 4 more

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