Body snapshot (#2100)

* fix test

* get rid of ObjectDatabase

* sn_builder_prototype2

* save state

* save state

* integration step1

* fix lint

* fix

* fix test

* integrate migrator.finish

* fix lint

* fix build

* fix typo

* save state

* body snapshot test

* unique tx

* body snapshot generation using walk

* move methods out of test

* block data verification added

* fix lint

* test with remove works correctly

* fix lint

* remove experiment test

* fix test

* add comment

* add second layer of remove test

* rename test

* fix typos

* fix lint

* revert testdata

* body snapshot migration save state

* fix body snapshot migration

* fix after merge

* remove debug test

* debug windows build

* fix build

* fix

* fix lint

* debug

* fix

* fix windows build

* simplify snapshot management&&get rid of lazy tx

* fix lint

* fix windows path

* debug

* debug

* debug

* debug

* remove geometry experiments

* skip windows tests

* clean

* fix

* fix ;int