v1.17: add merkle root meta column to blockstore (backport of #33979)

[mergify]

This is an automatic backport of pull request #33979 done by Mergify.
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Changes to be committed:
	modified:   ledger/src/blockstore/blockstore_purge.rs
	modified:   ledger/src/blockstore_db.rs
	modified:   ledger/src/blockstore_meta.rs

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   ledger/src/blockstore.rs

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[codecov]

Codecov Report

Merging #34028 (6c8f344) into v1.17 (fdaa4ca) will increase coverage by 0.0%.
Report is 1 commits behind head on v1.17.
The diff coverage is 57.1%.

Additional details and impacted files

@@           Coverage Diff           @@
##            v1.17   #34028   +/-   ##
=======================================
  Coverage    81.8%    81.8%           
=======================================
  Files         803      803           
  Lines      218075   218103   +28     
=======================================
+ Hits       178467   178506   +39     
+ Misses      39608    39597   -11     

[AshwinSekar]

This commit also includes #34091

[behzadnouri]

lgtm, but please wait for Steve to confirm we are good to backport this to v1.17

[steviez]

Given #34124, I think we should hold off on this one a bit longer. We need that PR into a release so we can resume feature activations on both testnet and devnet

[steviez]

I think I have a change that will allow us to avoid this and the v1.16 backport (granted my change will also have to be backported): #34174.

That PR will make the software able to handle any unknown column that it finds in a rocksdb database. This is obviously better in that any new future columns can avoid the backports.

The change is fairly straight forward and I think I should be able to land it in master/v1.17/v1.16 early this week. I'll comment here when that happens, or, if that PR encounters a roadblock, I'll give my approval for your backports

[AshwinSekar]

backport is no longer necessary with the addition of #34174

[AshwinSekar]

reopen