4844: bugfix and improve

[buddh0]

Description

bugfix

1. DeleteBlobSidecars when setHeadBeyondRoot
2. fix blob number check when downloading block body
3. modify resetItems a. add lock b. remove all data files and prevent from overflow c. set metadata d. sync index file before reopen

improvement

1. rename ReadRawBlobSidecars to ReadBlobSidecars
2. delete dead code in freezeRangeWithBlobs

Rationale

tell us why we need these changes...

Example

add an example CLI or API response...

Changes

Notable changes:

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