Feature/lex memory reduction (#762)

* Only do scrubbing if needed. When allocating content try to limit size (with scrubbing each token takes up 1k), now it's 16 bytes min size.

* Don't allocate for every call to write on the CallbackWriter - use the m_appendBuffer.

* Don't allocate memory for CallbackWriter use m_appendBuffer.

* Use UnownedStringSlice for suffix output for parsing float/int literals.
Fix typo in invalidFloatingPointLiteralSuffix

* Using memory arena to hold tokens that are not in SourceManager.

* Improve comment on lexing.

* Make UnownedStringSlice allocation simpler on SourceManager.

* Fix error on gcc around UnownedStringSlice - because VC converted string + UnownedStringSlice automatically into a String.

* Fix generateName needing concat string for gcc.

* When constructing a Token in parseAttributeName - because it's a Identifier, we have to set the Name.

* Remove translation through String on getIntrinsicOp

* Make func-cbuffer-param disablable with -exclude compatibility-issue

* Move memory leak in render-test.

* From review - can just use "?:" instead of performing a concat.

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