ObjectSpace.dump: handle Module#set_temporary_name

[Bug #20892]

Until the introduction of that method, it was impossible for a
Module name not to be valid JSON, hence it wasn't going through
the slower escaping function.

This assumption no longer hold.

Co-authored-by: Jean Boussier <jean.boussier@gmail.com>

Not all `ID` have an associated string.

Fixes a SEGFAULT in ObjectSpace.dump_all spec.

Node has not been managed by GC from Ruby 2.5.
Therefore these codes are not needed. If ObjectSpace depends on Node,
it needs to update the file when node type is updated. Delete node
related codes to avoid such update.

Too complex classes use a hash table to store ivs, and should always pin
their IVs.  We shouldn't touch those classes in compaction.

This reverts commit 5f3fb4f4e397735783743fe52a7899b614bece20.

This records the called_id and klass from imemo_callcache objects in
heap dumps.

This reverts commit f6910a61122931e4193bcc0fad18d839c319b720.

We're seeing crashes in the test suite of Shopify's core monolith after
this change.

We don't need to create a shape to transition capacity as we can
transition the capacity when the capacity of the SHAPE_IVAR changes.

This commit makes every initial size pool shape a root shape and assigns
it a capacity of 0.

I don't think it's possible to create a CI with a mid which would need
escaping to be in a JSON string, but I think we might as well not rely
on that assumption.