[PATCH 1 of 2] Add peg revision support to svn_opt__arg_canonicalize_*()

This is the first part of the patch necessary to address correctly handling
peg revision specifications in repository root urls.

[[[
Add peg revision support to svn_opt__arg_canonicalize_url() and
svn_opt__arg_canonicalize_path(). These functions are meant to process
user-input and so should handle the peg revision case.

* subversion/libsvn_subr/opt.c
  (split_arg_at_peg_revision): New function.
  (svn_opt__arg_canonicalize_url,
   svn_opt__arg_canonicalize_path): Allow the input argument to contain a peg
    revision specifier, and preserve it in the output utilizing
    split_arg_at_peg_revision().

* subversion/include/private/svn_opt_private.h
  (svn_opt__arg_canonicalize_url,
   svn_opt__arg_canonicalize_path): Update the doc string to reflect the fact
     that these functions can handle a peg revision in the input argument.
]]]

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