Update reply field in data of UserMessageSent event

[osipov-mit]

Changes

• Update reply field of Message type according to Replace reply data tuple with struct gear#1198
  Type of reply field is Struct with fields replyTo and exitCode instead of Tuple from now on
• Update type of waitlist and mailbox item according to Internal pallet module gear#1197
  From this moment the types are Tuple with 2 elements, the first one remained the same and the 2nd one is object with start and finish fields that show block's number when message gets into mailbox / waitlist and last block's number when message gets out of mailbox / waitlist
• Also waitlist.read and mailbox.read methods now return Codec types without keys.

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Bump @gear-js/api version to 0.24.0