[Feature Request] v-loading directive support change spinner and background dynamically

[Eflet]

Existing Component

Yes

Component Name

loading

Description

when using v-loading directive , only element-loading-text can be changed dynamically, element-loading-background and element-loading-spinner not watched. We have a requirement that need to display different spinner icon style when the status is different. I know I can use $loading to create loading instance, but it will be helpful if v-loading directive can support it.

[stale]

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