fix: trieJournal format compatible old db format

[jingjunLi]

Description

If trieJournal is stored in the database, it retains the old journal format; if trieJournal writes to the journal file using the new journal format;

Rationale

tell us why we need these changes...

Example

add an example CLI or API response...

Changes

Notable changes:

• add each change in a bullet point here
• ...

[RenRick]

LGTM

[fynnss]

LGTM

[NathanBSC]

can we avoid to change the interface of function loadDiffLayer, loadDiskLayer and journal?
we can already get JournalFilePath by db.config.JournalFilePath

[NathanBSC]

why a field length is need?
rlp decode will not use it, I also can't see other usage

[jingjunLi]

can we avoid to change the interface of function loadDiffLayer, loadDiskLayer and journal? we can already get JournalFilePath by db.config.JournalFilePath

We can avoid changing the interface of functions loadDiffLayer and loadDiskLayer. However, the journal is called by diffLayer and diskLayer, which cannot access db.config.JournalFilePath.