[NFCI] Move ProfOStream from InstrProfWriter.cpp to InstrProf.h/cpp (#136791)

ProfOStream is a wrapper class for output stream, and used by
InstrProfWriter.cpp to serialize various profiles, like PGO profiles and
MemProf.

This change proposes to move it into InstrProf.h/cpp. After this is in,
InstrProfWriter can dispatch serialization of various formats into
methods like `obj->serialize()`, and the serialization code could be
move out of InstrProfWriter.cpp into individual classes (each in a
smaller cpp file). One example is that we can gradually move
writeMemprof [1] into llvm/*/ProfileData/MemProf.h/cpp, where a couple
of classes already have `serialize/deserialize` methods.


[1]
https://github.com/llvm/llvm-project/blob/85b35a90770b6053f91d79ca685cdfa4bf6499a4/llvm/lib/ProfileData/InstrProfWriter.cpp#L774-L791

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