heap snapshot: add gc roots and gc finalist roots to fix unrooted nodes

[JianFangAtRai]

This PR is to fix the issue: #52432

1. Added logic to check unrooted nodes by looking at nodes without any incoming edges when serializing the heap snapshot
2. Fixed unrooted nodes from gc_mark_roots and added a GC root to them
3. Fixed unrooted nodes from gc_mark_finlist and added a finlist root to them
4. Fixed gc_mark_module_binding and put back gc_heap_snapshot_record_module_to_binding
5. Added assertion for zero unrooted nodes when serialize heap snapshot so that we could catch any regression

Before the fix, we have hundreds of unrooted nodes while taking a heapsnapshot of the julia process.

julia> using Profile
julia> Profile.take_heap_snapshot("jf-julia.heapsnapshot")
node count: 1041177
edge count: 3453348
orphan node count: 184
orphan nodes: ["5147","5149","5553","5555","7678","7680","8176","8178","9220","9222","11772","11774","12747","12749","13899","13901","14704","14706","15121","15123","18432","18434","19168","19170","21244","21246","23269","23271","24093","24095","26844","26846","27663","27665","28370","28372","28475","28477","34062","34064","34256","34258","36015","36017","36467","36469","37120","37122","37528","37530","39239","39241","39362","39364","52876","52878","55525","55527","60283","60285","63028","63030","72342","72344","101263","101265","103270","103272","103605","103607","105531","105533","120615","120617","123648","123650","132677","132679","135160","135162","144572","144574","150328","150330","173130","173132","209504","209506","236797","236799","316892","316894","456927","456929","537338","537340","554866","554868","578863","578865","582952","582954","585451","585453","586423","586425","634063","634065","702923","702925","703422","703424","712207","712209","712634","712636","725533","725535","729698","729700","732614","732616","732667","732669","732744","732746","737171","737173","754904","754906","765460","765462","860312","860314","862032","862034","862619","862621","862695","862697","866102","866104","873182","873184","874234","874236","874556","874558","895852","895854","918476","918478","919418","919420","922516","922518","927599","927601","928244","928246","929233","929235","929956","929958","940564","940566","940921","940923","943767","943769","947934","947936","948984","948986","950690","950692","1013089","1013091","1014901","1014903","1016206","1016208","1040145","1040147"]
orphan node: {type:(4,object), name:(17,GenericMemory{:not_atomic, UInt16, Core.AddrSpace{Core}(0x00)}), id:(0xffffaa557750,5147), self_size:24, edge_count:1, trace_node_id:0, detachedness:0}
orphan node: {type:(8,jl_svec_t), name:(1045,SimpleVector), id:(0xffffaa557770,5149), self_size:3648, edge_count:454, trace_node_id:0, detachedness:0}
orphan node: {type:(4,object), name:(3830,GenericMemory{:not_atomic, UInt8, Core.AddrSpace{Core}(0x00)}), id:(0xffffa7e2f820,5553), self_size:24, edge_count:1, trace_node_id:0, detachedness:0}
orphan node: {type:(8,jl_svec_t), name:(1045,SimpleVector), id:(0xffffa7e2f840,5555), self_size:1096, edge_count:135, trace_node_id:0, detachedness:0}
...

After the fix, the number of unrooted nodes is zero.

julia> using Profile
julia> Profile.take_heap_snapshot("jf-julia.heapsnapshot")
node count: 1041228
edge count: 3452686
orphan node count: 0
orphan nodes: []
"jf-julia.heapsnapshot"

The containment view on chrome DevTools:

Fixes #52432.

[NHDaly]

Thanks for the reviews and the merge, @vchuravy, @vtjnash, @IanButterworth! Sorry I wasn't able to get to it because of the holidays, thanks for taking care of it. 😎