az mariadb create minimalTlsVersion

> ### `az feedback` auto-generates most of the information requested below, as of CLI version 2.0.62

**Describe the bug**
"az mariadb server create" command does not have a property for minimalTlsVersion while the Azure REST API allows for this property at creation time.

**To Reproduce**
az mariadb create

**Expected behavior**
az mariadb create command should allow the --minimumTlsVersion switch to set TLS version to 1.0, 1.1 or 1.2.

**Environment summary**
Tested on the latest CLI version at this time.
"azure-cli": "2.2.0",
"azure-cli-command-modules-nspkg": "2.0.3",
"azure-cli-core": "2.2.0",
"azure-cli-nspkg": "3.0.4",
"azure-cli-telemetry": "1.0.4",
"extensions": {}

**Additional context**
If using Azure Policy to deny older TLS version than 1.2 you can not use Az CLI to create MariaDB server unless you use custom REST request.