* Add a new db engine
* Add tests for new engine
* Update tsh db subcommands
* Refactor error message and suggestions for unsupported tsh commands
* Add dynamodb to test plan
* Add AWS external ID to db config and update protos
* clusters.CreateGateway: Trim spaces when building a CLI command
If cliCommand.Env is empty, the returned command has an empty space at
the front.
* Do not pass TargetSubresourceName when fetching certs for gateway
Since we want to be able to freely specify the db name after the gateway
creation, let's not pass the db name when creating the gateway to show
the intent more clearly.
* Make CLICommand a method on Gateway rather than a field
* Extract getting cluster by resource URI to Storage
`mongosh` doesn't support `--tlsUseSystemCA` and `--tlsCAFile` combination passed together and fails CA validation with error when the required CA is not in the system store
```
MongoServerSelectionError: unable to verify the first certificate
```
This change makes those flags mutually exclusive.
* Extract dbcmd.go into a new package under lib/client/db/dbcmd
* Use dbcmd to generate CliCommand for gateways
* Return relative db command from tsh daemon
* Add WithTolarateMissingCLIClient func to dbcmd
Krzysztof Skrzętnicki