Add support for decoding profiling headers

Zubinrequested to merge
wip/profheaders into master

Query debugee for profiling mode and TNTC

Deserialize closures instead of relying on ghc-heap The above is necessary to decode profiling headers and ghc-heap does not

Additionally, deserialize info tables in haskell code instead of relying on ghc-heap. This is also necessary to decode profiling info tables properly.

Perhaps we should introduce a type for profiling info tables instead of using StgInfoTable

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