DataGridEditor gets columns by keys

[KremnevDmitry]

Environment

Jmix version: 2.3.999-SNAPSHOT

Bug Description

DataGridEditor gets columns by keys. In this case, it is implied that the column key will be equal to the value of the entity meta property name.

            <columns resizable="true">
                <column property="username" editable="true"/>
                <column key="firstname" property="firstName" editable="true"/>
                <column property="lastName"/>
                <column property="email"/>
                <column property="timeZoneId"/>
                <column property="active"/>
            </columns>

However, there may be cases when the key value is specified explicitly, then there will be an error here:

jmix/jmix-flowui/flowui/src/main/java/io/jmix/flowui/component/grid/editor/DataGridEditorImpl.java

Lines 412 to 417 in 1e7d34b

	@Override
	public void setColumnEditorComponent(String property,
	Function<EditComponentGenerationContext<T>, Component> generator) {
	Grid.Column<T> column = getGrid().getColumnByKey(property);
	setColumnEditorComponent(column, property, generator);
	}

Also, consider the case with repeating properties:

            <columns resizable="true">
                <column property="username" editable="true"/>
                <column key="username2" editable="true"/>
                <column property="firstName"/>
                <column property="lastName"/>
                <column property="email"/>
                <column property="timeZoneId"/>
                <column property="active"/>
            </columns>