Merge pull request #15688 from backstage/rugvip/conflogport

backend-app-api: move over logger and config implementations from backend-common

.changeset/brave-chicken-thank.md

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+---
+'@backstage/backend-common': patch
+---
+
+Internal refactor of the logger and configuration loading implementations.

.changeset/shaggy-buses-rescue.md

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+---
+'@backstage/backend-app-api': patch
+---
+
+Moved over logging and configuration loading implementations from `@backstage/backend-common`. There is a now `WinstonLogger` which implements the `RootLoggerService` through Winston with accompanying utilities. For configuration the `loadBackendConfig` function has been moved over, but it now instead returns an object with a `config` property.

.changeset/twelve-fans-own.md

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+---
+'@backstage/backend-plugin-api': patch
+---
+
+Updated the `RootLoggerService` to also have an `addRedactions` method.