feat: add multiple schema deletions

[p-spacek]

What does this PR do?

add schema modification to delete schemas from cache.

export enum MODIFICATION_ACTIONS {
  'delete',
  'add',
  'deleteWhole',
}

Motivation:

when dynamically changing shared schema, I use this deleteWhole schema action to delete old parent schemas from cache. So language server will reload parents schemas with updated referenced schema.

What issues does this PR fix or reference?

no ref

Is it tested? How?

added unit test

[coveralls]

Coverage decreased (-0.07%) to 75.983% when pulling 653ce39 on p-spacek:feat/delete-multiple-schemas into 1802872 on redhat-developer:master.

[JPinkney]

It looks good to me, my only suggestion would be to change deleteWhole to deleteAll or something like that

[p-spacek]

agree, had deleteAll before, but I overthink it...
renamed

[evidolob]

@p-spacek Can you update this PR? I'm going to merge it after.

[p-spacek]

Sorry I didn't notice.
Resolved

[evidolob]

@p-spacek No problem. Thank you, for your contribution!