refactor(shard): drop journal generic, metrics scrape, poll cursor

[numinnex]

No description provided.

[numinnex]

merge after #3911

[codecov]

Codecov Report

❌ Patch coverage is 53.30882% with 254 lines in your changes missing coverage. Please review.
✅ Project coverage is 57.99%. Comparing base (6043d19) to head (d9284e3).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
core/server/src/partition_reconciler.rs	0.57%	174 Missing ⚠️
core/metadata/src/impls/recovery.rs	21.42%	22 Missing ⚠️
core/simulator/src/lib.rs	42.85%	16 Missing ⚠️
core/shard/src/lib.rs	46.42%	15 Missing ⚠️
core/server/src/bootstrap.rs	92.45%	7 Missing and 1 partial ⚠️
core/configs/src/server_config/cluster.rs	81.48%	5 Missing ⚠️
core/server_common/src/executor.rs	86.11%	5 Missing ⚠️
core/server/src/dispatch.rs	40.00%	3 Missing ⚠️
core/consensus/src/plane_helpers.rs	50.00%	2 Missing ⚠️
core/partitions/src/types.rs	87.50%	1 Missing ⚠️
... and 3 more

Additional details and impacted files

@@              Coverage Diff              @@
##             master    #3914       +/-   ##
=============================================
- Coverage     83.69%   57.99%   -25.70%     
  Complexity     1358     1358               
=============================================
  Files          1212     1211        -1     
  Lines        165138   153050    -12088     
  Branches     132612   120649    -11963     
=============================================
- Hits         138215    88766    -49449     
- Misses        23274    60839    +37565     
+ Partials       3649     3445      -204     

Components	Coverage Δ
Rust Core	51.46% <53.30%> (-32.99%)	⬇️
Java SDK	66.67% <ø> (ø)
C# SDK	75.04% <ø> (-1.45%)	⬇️
Python SDK	90.00% <ø> (ø)
PHP SDK	84.48% <ø> (ø)
Node SDK	95.94% <ø> (+0.09%)	⬆️
Go SDK	68.32% <ø> (ø)

Files with missing lines	Coverage Δ
core/configs/src/common/server.rs	100.00% <100.00%> (ø)
core/configs/src/server_config/defaults.rs	100.00% <100.00%> (ø)
core/consensus/src/fatal.rs	0.00% <ø> (ø)
core/consensus/src/impls.rs	73.46% <100.00%> (-17.54%)	⬇️
core/journal/src/lib.rs	25.00% <ø> (ø)
core/journal/src/prepare_journal.rs	41.84% <ø> (-48.61%)	⬇️
core/metadata/src/impls/metadata.rs	70.10% <100.00%> (-16.50%)	⬇️
core/partitions/src/iggy_index_reader.rs	34.17% <ø> (-59.12%)	⬇️
core/partitions/src/iggy_partition.rs	57.76% <100.00%> (-29.14%)	⬇️
core/partitions/src/journal.rs	70.16% <ø> (-19.24%)	⬇️
... and 31 more

... and 449 files with indirect coverage changes

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