[Go SDK] Add more info to Worker Status API

[riteshghorse]

Adds Memory Usage information, Cache Stats, and Active Process Bundle States to worker status API added in #16957

Example Output (on Dataflow):

============Memory Usage============ 
heap in-use-spans/allocated/total/max = 5/4/15/7 MB stack in-use-spans/max = 0/0 MB GC-CPU percentage = 0.00 % Last GC time: 2022-06-10 16:34:35.629059975 +0000 UTC Next GC: 6 MB 
============Active Process Bundle States============ 
Bundle ID: process_bundle-369391211043651523-0 Bundle State: PTransform ID: CountWords/wordcount.extractFn-ptransform-40 Current state: Process Bundle All Bundle Process States: Bundle ID: CountWords/stats.Count/stats.keyedCountFn-ptransform-41 Execution State: State: Start Bundle IsProcessing: false Total time: 0s Execution State: State: Start Bundle IsProcessing: false Total time: 0s Execution State: State: Start Bundle IsProcessing: false Total time: 0s Execution State: State: Start Bundle IsProcessing: false Total time: 0s Bundle ID: CountWords/wordcount.extractFn-ptransform-40 Execution State: State: Start Bundle IsProcessing: false Total time: 0s Execution State: State: Start Bundle IsProcessing: false Total time: 9m57.8s Execution State: State: Start Bundle IsProcessing: false Total time: 0s Execution State: State: Start Bundle IsProcessing: false Total time: 9m57.8s Bundle ID: beam.createFn-ptransform-39 Execution State: State: Start Bundle IsProcessing: false Total time: 0s Execution State: State: Start Bundle IsProcessing: false Total time: 0s Execution State: State: Start Bundle IsProcessing: false Total time: 0s Execution State: State: Start Bundle IsProcessing: false Total time: 0s Bundle ID: CountWords/stats.Count/stats.SumPerKey/CombinePerKey/CoGBK+CountWords/stats.Count/stats.SumPerKey/CombinePerKey/stats.sumIntFn/Partial-ptransform-42 Execution State: State: Start Bundle IsProcessing: false Total time: 0s Execution State: State: Start Bundle IsProcessing: false Total time: 0s Execution State: State: Start Bundle IsProcessing: false Total time: 0s Execution State: State: Start Bundle IsProcessing: false Total time: 0s
 ============Cache Stats============ 
State Cache: {Hits:0 Misses:0 Evictions:0 InUseEvictions:0 ReStreamErrors:0} 
============Goroutine Dump============ 
goroutine profile: total 24 4 @ 0x438e96 0x431897 0x463909 0x49f1d2 0x4a053a 0x4a0528 0x6d2349 0x6e3d05 0x524874

See the bottom of https://docs.google.com/document/d/1dMTD5_sKdzLcnoe0ZsQU5Wf9q11uliyYgFnnOZQDzuI/ for more details.

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[codecov]

Codecov Report

Merging #21776 (ac6fc70) into master (7bf822a) will decrease coverage by 0.02%.
The diff coverage is 38.70%.

@@            Coverage Diff             @@
##           master   #21776      +/-   ##
==========================================
- Coverage   74.09%   74.07%   -0.03%     
==========================================
  Files         698      698              
  Lines       92503    92574      +71     
==========================================
+ Hits        68544    68577      +33     
- Misses      22704    22742      +38     
  Partials     1255     1255              

Flag	Coverage Δ
go	50.82% <38.70%> (-0.02%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
sdks/go/pkg/beam/core/metrics/store.go	10.63% <0.00%> (-4.99%)	⬇️
sdks/go/pkg/beam/core/runtime/harness/harness.go	10.20% <0.00%> (-0.09%)	⬇️
...beam/core/runtime/harness/statecache/statecache.go	74.65% <0.00%> (-2.11%)	⬇️
.../go/pkg/beam/core/runtime/harness/worker_status.go	72.36% <94.73%> (+21.20%)	⬆️

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[riteshghorse]

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[github-actions]

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[lostluck]

We can remove this change. At best, we mostly want to remove the blank line between "strings" and "fmt".

[lostluck]

Please add documentation around "expected" Environment variables. TBH, I don't mind the options approach to pass into main, but the fetching form the Env vars would then happen in the init.go.

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[lostluck]

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[riteshghorse]

Made the changes, PTAL

[riteshghorse]

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