Append Composer ui schema 'flow' part to component schema files

[yeze322]

(Copied from C#. Refs microsoft/botbuilder-dotnet#5099)
follows #2986

Description

In #2986, we port the ui schema form part to runtime in order to support the customization of Composer Form Editor;
in this PR, the flow part is added to runtime as well to support the customization of Composer Flow Editor.

Refs ui.schema definition change in SDK repo: microsoft/botframework-sdk#6163

Affected SDK $kinds

• QnAMakerDialog
• BeginDialog
• BeginSkill
• CancelAllDialog
• DeleteProperty, DeleteProperties
• EditActions
• EditArray
• EmitEvent
• Foreach, ForeachPage
• GetActivityMembers, GetConversationMembers
• HttpRequest
• IfCondition
• ReplaceDialog
• SendActivity
• SetProperties, SetProperty
• SwitchCondition
• ThrowException
• UpdateActivity
• Ask
• AttachmentInput, ChoiceInput, ConfirmInput, DateTimeInput, NumberInput, TextInput
• OAuthInput

Example

Below is an example of the flow schema:

{
    "$schema": "https://schemas.botframework.com/schemas/ui/v1.0/ui.schema",
    "form": {...},
    "flow": {
        "widget": "ActionCard",
        "body": {
            "widget": "ResourceOperation",
            "operation": "=coalesce(action.changeType, \"?\")",
            "resource": "=coalesce(action.itemsProperty, \"?\")"
        },
        "footer": {
            "widget": "PropertyDescription",
            "property": "=action.resultProperty",
            "description": "= Result"
        },
        "hideFooter": "=!action.resultProperty"
    }
}

which describes the Microsoft.EditArray type in Composer as

[coveralls]

Pull Request Test Coverage Report for Build 519949063

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.01%) to 84.702%

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Totals
Change from base Build 519010468:	-0.01%
Covered Lines:	18071
Relevant Lines:	20366

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💛 - Coveralls