Bicep compiler merge (radius-project#7662)

This PR contains all the changes for the Bicep compiler merge. The
branch has had smaller PRs opened for specific features that can be
found below:

- [x] Bicep types generator is updated to use the `bicep-types`
repository as a submodule. This includes updating the types contract and
adding support for resource methods (eg `listSecrets`):
radius-project@43403fd
. There was also a small update to how we handle flags on the `location`
[property](radius-project@19afe96)
- [x] Update to build workflow to initialize the submodule and publish
types to `biceptypes.azurecr.io` using the `bicep publish-extension`
command:
radius-project@fed2462
- [x] Update validate bicep workflow to validate bicep files in the
repository with the official Bicep compiler. This includes updating
extension imports of all bicep files and adding a `bicepconfig.json` to
the repository: radius-project#7702
- [x] Update functional test workflow to publish types to
`biceptypes.azurecr.io`. This includes publishing the bicep types to a
PR tag and adding a temporary `bicepconfig.json` to consume the
PR-specific types [radius-project#7730]
- [x] Update release workflow to publish types to a release-specific
tag. This includes running a build in the `bicep-types-aws` repo to
publish AWS types to a release tag
- [x] Updates to `rad bicep download`. This command will download the
official Bicep binary instead of the Radius one. The install script
calls this command so the official Bicep binary will be downloaded on a
Radius install:
radius-project@bb8da88
- [x] Updates to `rad init` to generate a default `bicepconfig.json`.
This will pull the Radius and AWS types in our ACR with the current
release tag: radius-project#7664

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Signed-off-by: sk593 <shruthikumar@microsoft.com>

bicepconfig.json

@@ -7,5 +7,8 @@
 	"extensions": {
 		"radius": "br:biceptypes.azurecr.io/radius:latest",
 		"aws": "br:biceptypes.azurecr.io/aws:latest"
+	},
+	"cloud": {
+		"credentialPrecedence": ["Environment"]
 	}
 }