memtx: simplify and refactor memtx_tx_history_add_stmt
Almost completely rewrite, simplify and comment this part of code. Part of #8648 Part of #8654 NO_DOC=refactoring NO_TEST=refactoring NO_CHANGELOG=refactoring
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Almost completely rewrite, simplify and comment this part of code. Part of #8648 Part of #8654 NO_DOC=refactoring NO_TEST=refactoring NO_CHANGELOG=refactoring