Hotfix/segment cache panic

[alonlong]

1. add the error handler for different cache
2. solve the panic when root node is not ready for segment

[petethepig]

There's one test that's failing. Could you fix it please? https://github.com/pyroscope-io/pyroscope/pull/222/checks?check_run_id=2694916899

Other than that it looks good I think.

[alonlong]

done, please help to check

[codecov]

Codecov Report

Merging #222 (9fbf730) into main (63e622f) will decrease coverage by 0.83%.
The diff coverage is 45.80%.

@@            Coverage Diff             @@
##             main     #222      +/-   ##
==========================================
- Coverage   56.97%   56.14%   -0.82%     
==========================================
  Files          73       73              
  Lines        2988     3039      +51     
==========================================
+ Hits         1702     1706       +4     
- Misses       1135     1165      +30     
- Partials      151      168      +17     

Impacted Files	Coverage Δ
pkg/agent/profiler/profiler.go	0.00% <0.00%> (ø)
pkg/agent/selfprofile.go	0.00% <0.00%> (ø)
pkg/cli/cli.go	54.45% <0.00%> (-0.40%)	⬇️
pkg/storage/dict/serialize.go	61.37% <0.00%> (ø)
pkg/storage/dimension/serialization.go	0.00% <0.00%> (ø)
pkg/storage/segment/serialization.go	73.87% <0.00%> (-1.71%)	⬇️
pkg/storage/tree/serialize.go	70.09% <0.00%> (ø)
pkg/storage/storage.go	62.03% <51.29%> (-9.32%)	⬇️
pkg/agent/upstream/remote/remote.go	65.63% <62.50%> (+0.84%)	⬆️
pkg/exec/cli.go	39.78% <62.50%> (-0.65%)	⬇️
... and 5 more

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[petethepig]

LGTM