Improve undefined sanitizer support. #318
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Otherswise Clang will report the following:
```
.../include/standalone/fakeit.hpp:5337:47: runtime error: member call on address 0x7ffc27172e08 which does not point to an object of type 'rtc::test::tpsclient::ITestCaseHandler'
0x7ffc27172e08: note: object is of type 'fakeit::VirtualOffsetSelector'
00 00 00 00 38 b1 5e 00 00 00 00 00 10 c0 91 01 00 00 00 00 10 c0 91 01 00 00 00 00 f8 1d 05 01
^~~~~~~~~~~~~~~~~~~~~~~
vptr for 'fakeit::VirtualOffsetSelector'
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior .../include/standalone/fakeit.hpp:5337:47 in
```
Disarm UBSAN for VirtualOffsetSelector cast
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Based on #261, should fix #304.
Added a new action in the GitHub CI as well to run tests with sanitizers enabled (for GCC and Clang).