tests: Added GTests for base/str.cc

Adding these tests supercedes the unittest/strnumtest.cc
and unittest/tokentest.cc tests. They have thereby been removed.

Function "to_number" in base/str.hh previously failed to cast negative
float/double numbers. This was due to the use of
std::numeric_limits<T>::min() instead of std::numeric_limits<T>::lowest()
to determine whether a string-to-float/double conversion was
"Out of range". Tests "StrTest.ToNumberFloatNegative" and
"StrTest.ToNumberDoubleNegative" exposed this bug. It has been fixed.

Methods "split_first" and "split_last" in base/str.hh have had their
documentation updated to remove abiguity in their functionality.

Change-Id: I16e0fe40d884e22dd010db4045857eb6e7f33d4a
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/22084
Reviewed-by: Daniel Carvalho <odanrc@yahoo.com.br>
Maintainer: Jason Lowe-Power <jason@lowepower.com>
Tested-by: kokoro <noreply+kokoro@google.com>

src/base/SConscript

@@ -71,6 +71,7 @@ if env['TARGET_ISA'] != 'null':
 Source('socket.cc')
 Source('statistics.cc')
 Source('str.cc')
+GTest('str.test', 'str.test.cc', 'str.cc')
 Source('time.cc')
 Source('trace.cc')
 GTest('trie.test', 'trie.test.cc')