Introduce XSL transformation that unrolls nested dispatches into a single object

[maxonfjvipon]

The canonical XMIR ready to be converted to java is XMIR is reversed notation, explained here and here.
But it seems it's quite hard to read and not convenient for some extra cases, like this IT.

So it would be better to have a transformation that would turn this XMIR:

<o base=".seq">
  <o base=".eolang">
    <o base=".org">
      <o base="Q"/>
    </o>
    </o>
  </o>
  <o base=".opcode">
    <o base=".jeo">
      <o base=".eolang">
        <o base=".org">
          <o base="Q"/>
        </o>
      </o>
    </o>
  </o>
</o>

into such one:

<o base="Q.org.eolang.seq">
  <o base="Q.org.eolang.jeo.opcode"/>
</o>

[maxonfjvipon]

Done here