sql_browser: use monaco editor
Use monaco editor with https://github.com/joe-re/sql-language-server completion provider bundled in https://lab.nexedi.com/jerome/monaco-editor-sql-completion-provider This completion provider is not perfect, but codemirror's one was not so good either. At least we can use monaco editor.
Also add a quick "copy to cliboard" feature, which copies the table as html or in markdown format for text.
And also fix Server-Timing header that was an obsolete syntax no longer supported by chrome.