fet: implement ublk frontend for v2 data engine

[PhanLe1010]

Which issue(s) this PR fixes:

Issue # longhorn/longhorn#9456

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[codecov]

Codecov Report

Attention: Patch coverage is 9.21053% with 414 lines in your changes missing coverage. Please review.

Project coverage is 20.80%. Comparing base (dae1360) to head (06d04cc).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
app/cmd/basic/ublk.go	0.00%	176 Missing ⚠️
pkg/nvme/initiator.go	19.81%	159 Missing and 11 partials ⚠️
pkg/spdk/client/basic.go	0.00%	56 Missing ⚠️
pkg/util/device.go	0.00%	6 Missing ⚠️
app/cmd/nvmecli/nvmecli.go	0.00%	4 Missing ⚠️
pkg/jsonrpc/types.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #198      +/-   ##
==========================================
- Coverage   22.46%   20.80%   -1.66%     
==========================================
  Files          34       35       +1     
  Lines        5022     5459     +437     
==========================================
+ Hits         1128     1136       +8     
- Misses       3717     4140     +423     
- Partials      177      183       +6     

Flag	Coverage Δ
unittests	20.80% <9.21%> (-1.66%)	⬇️

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