Fix deepsource: RVV-B0011 exported function returning value of unexported type

[vankichi]

Description:

I have fixed the RVV-B0011.

Fixing the issue, required changing the test code at the internal/cache package.

I have changed the checkFunc to ensure comparing struct which satisfies the Cache interface instead of using go-cmp.
The code is like:

checkFunc := func(want, got Cache) error {
        cw := reflect.ValueOf(want.(*cache))
        cg := reflect.ValueOf(got.(*cache))
        for i := 0 ; i < reflect.Indirect(cg).NumFiled(); i++ {
                // compare
        }
        return nil
}

Related Issue:

Versions:

• Go Version: 1.19.2
• Docker Version: 20.10.8
• Kubernetes Version: 1.22.0
• NGT Version: 1.14.8

Checklist:

• I have read the CONTRIBUTING document and completed our CLA agreement.
• I have checked open Pull Requests for the similar feature or fixes?

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[codecov]

Codecov Report

Base: 30.54% // Head: 30.52% // Decreases project coverage by -0.02% ⚠️

Coverage data is based on head (6389062) compared to base (f6f55f9).
Patch coverage: 88.88% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1848      +/-   ##
==========================================
- Coverage   30.54%   30.52%   -0.03%     
==========================================
  Files         367      367              
  Lines       33833    33833              
==========================================
- Hits        10335    10328       -7     
- Misses      23086    23091       +5     
- Partials      412      414       +2     

Impacted Files	Coverage Δ
internal/cache/cacher/cacher.go	100.00% <ø> (ø)
internal/net/dialer.go	78.40% <ø> (+0.99%)	⬆️
pkg/agent/sidecar/service/storage/storage.go	0.00% <0.00%> (ø)
internal/cache/cache.go	100.00% <100.00%> (ø)
internal/cache/gache/gache.go	100.00% <100.00%> (ø)
internal/config/compress.go	100.00% <100.00%> (ø)
internal/log/zap/zap.go	84.42% <100.00%> (ø)
internal/net/option.go	88.50% <100.00%> (ø)
internal/params/params.go	100.00% <100.00%> (ø)
...nt/core/ngt/service/vqueue/uninserted_index_map.go	64.51% <0.00%> (-5.92%)	⬇️
... and 4 more

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LGTM