Enable Queries to Iavl for Non-Migrating Nodes

[Kbhat1]

Describe your changes and provide context

• Allows running sc-migration and setting --migrate-height on a node
• Queries before migrate height will be routed to iavl and after to seidb

Testing performed to validate your change

• Tested and verified on a rpc node that ran sc migration and migrate height

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 61.50%. Comparing base (6730097) to head (ee9f0af).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
app/seidb.go	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1954      +/-   ##
==========================================
- Coverage   61.68%   61.50%   -0.18%     
==========================================
  Files         263      263              
  Lines       23394    23394              
==========================================
- Hits        14430    14388      -42     
- Misses       7959     8005      +46     
+ Partials     1005     1001       -4     

Files with missing lines	Coverage Δ
app/seidb.go	80.35% <0.00%> (ø)

... and 2 files with indirect coverage changes

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