API: Move tail-related APIs to another namespace

[catloversg]

This PR implements the change discussed at https://discord.com/channels/415207508303544321/459097632896188436/1318894499170095176 and https://discord.com/channels/415207508303544321/459097632896188436/1332765650728390697.

Changes:

• ns.tail -> ns.ui.openTail
• ns.moveTail -> ns.ui.moveTail
• ns.resizeTail -> ns.ui.resizeTail
• ns.setTitle -> ns.ui.setTailTitle
• ns.setTailFontSize -> ns.ui.setTailFontSize
• ns.closeTail -> ns.ui.closeTail
• ns.renderTail -> ns.ui.renderTail (This API has not been released, so we don't have to maintain the old version).

Note: I don't implement migration code and API break notice in this PR. I think we should do that in another PR when we decide to remove the support of the old APIs. Maybe it's v3.0.0.

Test code:

/** @param {NS} ns */
export async function main(ns) {
  ns.tail();
  ns.moveTail(100, 100);
  ns.resizeTail(500, 500);
  ns.setTitle("test");
  ns.setTailFontSize(15);
  ns.closeTail();
}

Screenshot:

[d0sboots]

setTailFontSize was also within this version, so doesn't need deprecation.

Edit: Other than that, looks good.