docs: add changeset files

Signed-off-by: Camila Belo <camilaibs@gmail.com>

.changeset/blue-keys-do.md

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+---
+'@backstage/frontend-plugin-api': minor
+---
+
+**BREAKING**: Replace default plugin extension and plugin ids to be `app` instead of `root`.

.changeset/gorgeous-pumas-draw.md

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+---
+'@backstage/plugin-analytics-module-newrelic-browser': minor
+'@backstage/plugin-analytics-module-ga4': minor
+'@backstage/plugin-analytics-module-ga': minor
+---
+
+**BREAKING**: Add support to the new analytics api and use `app` as default extension and plugin ids. It is breaking only because you will start seeing app as the new default id for extensions and plugins events.

.changeset/old-papayas-shave.md

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+---
+'@backstage/frontend-app-api': patch
+---
+
+Wrap the root element with the analytics context to ensure it always exists for all extensions.

.changeset/shaggy-trainers-rule.md

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+---
+'@backstage/core-plugin-api': patch
+---
+
+Throw a more specific exception `NotImplementedError` when an API implementation cannot be found.