fix: heartbeat raise error if no version diff

[MrCroxx]

Changes:

• Add an empty VersionDiff when rudder start, or heartbeater will raise a VersionDiffExpired error and immediately send another heartbeat.
• Add more tracing and metrics.
• Add file log support.

[codecov[bot]]

Codecov Report

Merging #147 (633f984) into main (5a69b91) will increase coverage by 0.21%. The diff coverage is 75.00%.

@@            Coverage Diff             @@
##             main     #147      +/-   ##
==========================================
+ Coverage   82.53%   82.75%   +0.21%     
==========================================
  Files          78       78              
  Lines        7559     7649      +90     
==========================================
+ Hits         6239     6330      +91     
+ Misses       1320     1319       -1     

Impacted Files	Coverage Δ
wheel/src/config.rs	100.00% <ø> (ø)
wheel/src/service.rs	82.20% <ø> (-0.13%)	:arrow_down:
wheel/src/worker/heartbeater.rs	81.81% <ø> (-6.82%)	:arrow_down:
common/src/log.rs	59.49% <55.17%> (+46.72%)	:arrow_up:
storage/src/raft_log_store/log.rs	90.20% <80.00%> (-0.43%)	:arrow_down:
rudder/src/lib.rs	86.40% <92.30%> (+0.31%)	:arrow_up:
storage/src/raft_log_store/store.rs	90.49% <100.00%> (+0.74%)	:arrow_up:
wheel/src/worker/raft.rs	88.08% <100.00%> (+1.08%)	:arrow_up:
storage/src/lsm_tree/manifest/error.rs	0.00% <0.00%> (-100.00%)	:arrow_down:
rudder/src/error.rs	0.00% <0.00%> (-14.29%)	:arrow_down:
... and 12 more

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