Windows: absolute path-table names are not recognized #1185

Found by the Windows CI job added in #1178 (run https://github.com/thekevinscott/dirsql/actions/runs/35995035941).

A path-table name that is a Windows absolute path is not recognized:

dirsql query: no such table: C:\Users\...\Temp\.tmpPBvbMe/*.md; did you mean './C:\Users\...\Temp\.tmpPBvbMe/*.md'?

path_table parsing assumes /-rooted absolute paths (drive letters and \ are not handled), and its normalization turns /x/a into \x\a on Windows (path_table::tests::an_absolute_*, a_parent_relative_path_*, a_home_relative_path_*; path_table_globs.rs an_absolute_*; path_table_cli_e2e.rs).

Done when absolute and ~/ path-tables resolve on the Windows tests job.