Remove number support from the router

The router historically came from crow.  Crow supported wildcards of
<int>, <float>, and <double>.  bmcweb doesn't use them, nor should it in
basically any case, as we now have explicit 404 handling.

This commit removes them.  This amounts to about -450 lines of code, but
it's some of the scarier code we have, some of it existing in the
namespace "black_magic".  Reducing the brain debt for people working in
this subsystem seems worthwhile.  There is no case in the future where
we would use integer based url parameters.

Tested: Redfish service validator passes.  Should be good enough
coverage for a code removal.

Signed-off-by: Ed Tanous <edtanous@google.com>
Change-Id: I34add8df7d3486952474ca7ec3dc6be990c50ed0