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This PR adds support in the gSYM format for call site information and adds support for loading call sites from a YAML file. The support for YAML input is mostly for testing purposes - so we have a way to test the functionality. Note that this data is not currently used in the gSYM tooling - the logic to use call sites will be added in a later PR. The reason why we need call site information in gSYM files is so that we can support better call stack function disambiguation in the case where multiple functions have been merged due to optimization (linker ICF). When resolving a merged function on the callstack, we can use the call site information of the calling function to narrow down the actual function that is being called, from the set of all merged functions. See [this RFC](https://discourse.llvm.org/t/rfc-extending-gsym-format-with-call-site-information-for-merged-function-disambiguation/80682) for more details on this change.