WIP: fix(gnovm): size bound methods by the wrapper, not the wrapped func's package

[ltzmaxwell]

WIP / stacked on #5737. Based on that branch, so the diff below includes #5737's commits — only the final commit (BoundMethodValue.GetShallowSize) is in scope here. Will rebase onto master once #5737 merges. Do not review until then.

• BoundMethodValue.GetShallowSize returned 0 when the wrapped Func's PkgPath was ".uverse", under-counting a real, dynamically-allocated bmv wrapper of a uverse method — e.g. g := addr.String, a value-method on the concrete uverse address type — by allocBoundMethod (248 bytes; confirmed via runtime.MemStats).
• A bmv is a runtime composite with no PkgPath of its own (unlike PackageValue/Block/FuncValue, which correctly key on their own package); its size is now always allocBoundMethod, with counting governed by GC/persistence reachability.
• Hard-fork: observably changes GC/persist sizing.
• Test: TestBoundMethodValueGetShallowSize pins the size for uverse-func / lazy (Func==nil) / normal bmvs.

[Gno2D2]

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