Remove unsed the functioin StateProvider

[tnasu]

Description

The function StateProvider() is used to override the state provider in the state sync case. It is unstable and easy to change, and currently, the function is not used anywhere in the codebase. So I remove the aforementioned function for code maintenance.

[codecov]

Codecov Report

Merging #508 (d7ef80d) into main (e6f57a1) will increase coverage by 0.16%.
The diff coverage is n/a.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #508      +/-   ##
==========================================
+ Coverage   65.39%   65.55%   +0.16%     
==========================================
  Files         278      278              
  Lines       37995    37968      -27     
==========================================
+ Hits        24846    24890      +44     
+ Misses      11328    11273      -55     
+ Partials     1821     1805      -16     

Impacted Files	Coverage Δ
node/node.go	60.44% <ø> (+0.24%)	⬆️
abci/client/socket_client.go	72.09% <0.00%> (-0.88%)	⬇️
p2p/conn/connection.go	79.80% <0.00%> (-0.20%)	⬇️
consensus/state.go	73.15% <0.00%> (-0.12%)	⬇️
crypto/vrf/vrf_libsodium.go
crypto/vrf/vrf_r2ishiguro.go	100.00% <0.00%> (ø)
p2p/switch.go	66.52% <0.00%> (+0.61%)	⬆️
types/voter_set.go	85.62% <0.00%> (+0.84%)	⬆️
blockchain/v0/pool.go	79.06% <0.00%> (+1.03%)	⬆️
consensus/reactor.go	75.37% <0.00%> (+1.14%)	⬆️
... and 5 more