fix dumping jason add toolsAndroid

[jafu888]

This add a toolsAndroid directory for small code tools that people can use to gain insight into ConstraintLayout related stuff.
(toolsDesktop to follow)
Also updates ConstraintSet JSON writer

[jafu888]

This is logging api
The rest of the code here support various other uses.
Another CL will have Desktop viewer for the CL

    <androidx.constraintlayout.helper.widget.LogJson
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:visibility="gone"
        app:logJsonTo="log"
        app:logJsonMode="delayed"
        app:logJsonDelay="10000"
        />

attrs.xml

    <declare-styleable name="LogJson">
        <attr name="logJsonTo" format="enum|string">
            <enum name="log" value="1" />
            <enum name="console" value="2" />
        </attr>
        <attr name="logJsonMode" format="enum">
            <enum name="periodic" value="1" />
            <enum name="delayed" value="2" />
            <enum name="layout" value="3" />
            <enum name="api" value="4" />
        </attr>
        <attr name="logJsonDelay" format="integer" />
    </declare-styleable>
    ```