Optimized OString operator += overloads

...similar to how OUString got an operator += overload for std::u16string_view
with c927aab29ebfff1ce3ac0b2f27ae343025a9890c "Make the OUString ctors taking
raw sal_Unicode pointer/non-const array explicit".  In this case, though, we can
easily add enough overloads (which forward to the one taking std::string_view)
to avoid any ambiguities at call sites.

We had left this out in the past as there is no suitable rtl_string_newConcat*
function to use in the implementation, but we already had inline implementations
of OStringConcat/OStringNumber overloads, so stick to that pattern here with the
new std::string_view overload.

Change-Id: I329036ea2b62cb921b4dbc1eef7c45a9cdb56e13
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/115452
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>

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