Alert: Add close button with auto-dismiss

[jmanke]

Description

On the calcite-alert, using the auto-close property will remove the close button. It would be nice to have an option to keep the close button when auto-close is present. The user may want to close the alert before the auto-dismiss-duration is over.

Acceptance Criteria

Either keep the close button when auto-dismiss is enabled or add it as an option (maybe as another property).

Relevant Info

No response

Which Component

calcite-alert

Example Use Case

An alert with auto-dismiss is prompted saying your download is complete. The user sees the alert and wants to clear it because it is blocking other UI they want to interact with. However, they must wait until the duration completes. Adding a close button will make the experience less clunky.

[macandcheese]

@jmanke - This is referenced in this issue - #3338, could you give a plus one in that thread? I am going to close this as a duplicate.