Do Not Submit. [Go SDK] Data layer rewrite for Timer handling

[lostluck]

Significant further testing needs to be done before this is committed to the repo, given the importance of the datalayer in portable beam pipelines.

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[codecov]

Codecov Report

Merging #25683 (5c05152) into master (b5ce110) will decrease coverage by 0.20%.
The diff coverage is 44.62%.

@@            Coverage Diff             @@
##           master   #25683      +/-   ##
==========================================
- Coverage   71.41%   71.21%   -0.20%     
==========================================
  Files         778      780       +2     
  Lines      102379   102855     +476     
==========================================
+ Hits        73112    73253     +141     
- Misses      27811    28125     +314     
- Partials     1456     1477      +21     

Flag	Coverage Δ
go	53.59% <44.62%> (-0.34%)	⬇️

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

Impacted Files	Coverage Δ
sdks/go/pkg/beam/core/graph/edge.go	3.35% <ø> (ø)
sdks/go/pkg/beam/core/runtime/exec/coder.go	57.68% <ø> (-0.36%)	⬇️
sdks/go/pkg/beam/core/runtime/exec/data.go	0.00% <ø> (ø)
sdks/go/pkg/beam/core/runtime/exec/timers.go	0.00% <0.00%> (ø)
sdks/go/pkg/beam/core/runtime/graphx/serialize.go	27.39% <0.00%> (-0.17%)	⬇️
sdks/go/pkg/beam/core/runtime/graphx/translate.go	37.56% <0.00%> (-0.44%)	⬇️
sdks/go/pkg/beam/core/runtime/harness/harness.go	10.93% <0.00%> (-0.09%)	⬇️
sdks/go/pkg/beam/core/funcx/fn.go	53.38% <2.94%> (-3.92%)	⬇️
sdks/go/pkg/beam/core/runtime/exec/translate.go	23.22% <5.26%> (-0.52%)	⬇️
sdks/go/pkg/beam/core/runtime/exec/plan.go	66.66% <11.11%> (-3.34%)	⬇️
... and 9 more

... and 2 files with indirect coverage changes

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[github-actions]

This pull request has been marked as stale due to 60 days of inactivity. It will be closed in 1 week if no further activity occurs. If you think that’s incorrect or this pull request requires a review, please simply write any comment. If closed, you can revive the PR at any time and @mention a reviewer or discuss it on the dev@beam.apache.org list. Thank you for your contributions.

[lostluck]

Closed since this has been merged in in other PRs.