Merge PR: iaviewer update (#1539)

* db backend support

* keep db open once

* rename

* iaviewer list all modules

* update iaviewer read

* fix printTree

* update iaviewer description

* func iaviewerCmdPreRun

* rename readDiff

* use fmt instead of log

* reorg print logical

* iaviewer version cmd

* fix db error

* printIaviewerStatus

* iaviewer contex & start / limit flags

* parse args & flags

* hex flag

* update dafault kv formatter

* prefix flag

* fix version limit

* iavl status cmd

* remove status print in other cmd

* result set status of iavl read

* iaviewer read specified key

* update flagprefix description

* iaviewer read keyprefix flag

* update evmPrintKey

* update accPrintKey

* update paramsPrintKey

* update stakingPrintKey

* update govPrintKey

* update tokenPrintKey

* update mainPrintKey

* update slashingPrintKey

* update distributionPrintKey

* update diff cmd

* fix keyprefix

* update key flag

* update printIaviewerStatus

* update diff

Co-authored-by: xiangjianmeng <[email protected]>