Updated namespace for `ResetEnvelopeTemplateCommand` and added default values for constructor parameters. Enhanced `EmailTemplateController` by making the `Update` method asynchronous, adding error handling, and incorporating a `try-catch` block for improved responsiveness and error management.
- Modified `ResetEnvelopeTemplateCommand` to implement `IRequest`.
- Introduced `ResetEnvelopeTemplateCommandHandler` to handle requests.
- Added a collection of default email templates for notifications.
- Updated `UpdateEmailTemplateCommand` to use a property for `EmailTemplateQuery` with `JsonIgnore`, allowing optional body and subject parameters.
- Simplified `UpdateToDefaultCommand` by removing documentation comments and constructor parameters.
- Corrected namespace for `ReadEmailTemplateQuery` from `Query.Read` to `Queries.Read`.
- Introduced `ResetEnvelopeTemplateCommand` with optional ID and type, inheriting from `EmailTemplateQuery`, along with detailed XML documentation.
- Added `EmailTemplateController` to manage email templates, including methods for retrieval and updates, utilizing AutoMapper and authorization attributes.
