Add logs for snapshot export and import

[yzang2019]

Describe your changes and provide context

Testing performed to validate your change

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 55.26%. Comparing base (1fa43a5) to head (bb66cd0).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #528      +/-   ##
==========================================
- Coverage   55.27%   55.26%   -0.02%     
==========================================
  Files         631      631              
  Lines       54284    54305      +21     
==========================================
+ Hits        30005    30009       +4     
- Misses      22135    22152      +17     
  Partials     2144     2144              

Files	Coverage Δ
store/rootmulti/store.go	71.33% <100.00%> (-0.04%)	⬇️
storev2/rootmulti/store.go	2.67% <0.00%> (-0.05%)	⬇️

... and 3 files with indirect coverage changes