Added virtual file system to the compiler and IDE support #16298
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Description
This PR adds support for virtual file system, allowing the compiler to build a package from files kept by the IDE in memory.
It also fixes an existing bug (move-language/move#1082) where source files used in the symbolicator (obtained from resolution graph) and source files used by the compiler could be modified between the two uses resulting in different file hashes which can ultimately lead to crash when translating diagnostics (generated by the compiler and using "compiler file hashes") using symbolicator source files (and "symbolicator file hashes")
Test Plan
All existing tests must pass. Also, manually tested the IDE no longer needs file saves to reflect changes in the file (e.g., compiler diagnostics appear as the code is being typed).