Add docs for PSES support with non-VSCode clients

[SydneyhSmith]

@andschwa recently got PSES v3 working with non-VSCode clients https://github.com/PowerShell/PowerShellEditorServices/pull/1820 We should better document how to integrate with PSES

[andyleejordan]

We need to improve the way we actually execute PSES. First off, we need our cmdlet to have smart defaults, because right now it's a super long string you have to get right, and it's requiring absolute paths in some but not all cases. Very annoying. Let's get it as simple as possible, then document, and then maybe propose bundling PSES into PowerShell with a -lsp flag.