feat(tolk/completion): add completion option for field with Cell<Foo> type, to create Foo {}.toCell() expression#112

i582 merged 2 commits intomainton-blockchain/ton-language-server:mainfrom

pmakhnev/field-init-completion-for-Cell<T>-typeton-blockchain/ton-language-server:pmakhnev/field-init-completion-for-Cell<T>-typeCopy head branch name to clipboard