chore: splitting warehouse package

[achettyiitr]

Description

• Splitting warehouse packages into smaller packages. (admin, api, backend_config, constraints, errors, mode, router, slave, types)

Linear Ticket

• https://linear.app/rudderstack/issue/PIPE-222/splitting-warehouse-packages-into-individual-packages

Security

• The code changed/added as part of this pull request won't create any security issues with how the software is being used.

[codecov]

Codecov Report

Patch coverage: 89.59% and project coverage change: -0.05% ⚠️

Comparison is base (43b645b) 69.31% compared to head (c3f96b1) 69.26%.

Additional details and impacted files

@@                        Coverage Diff                        @@
##           chore.introduce-warehouse-app    #3828      +/-   ##
=================================================================
- Coverage                          69.31%   69.26%   -0.05%     
=================================================================
  Files                                354      355       +1     
  Lines                              52594    52650      +56     
=================================================================
+ Hits                               36454    36469      +15     
- Misses                             13824    13871      +47     
+ Partials                            2316     2310       -6     

Files Changed	Coverage Δ
warehouse/api/grpc.go	79.86% <ø> (ø)
warehouse/errors/errors.go	100.00% <ø> (ø)
warehouse/router/upload_stats.go	62.33% <ø> (ø)
warehouse/types/types.go	70.00% <ø> (ø)
warehouse/router/identities.go	19.83% <11.11%> (ø)
router/batchrouter/handle_observability.go	58.62% <50.00%> (ø)
warehouse/admin/admin.go	7.14% <50.00%> (ø)
warehouse/router/scheduling.go	95.23% <50.00%> (ø)
warehouse/bcm/bcm.go	82.32% <58.33%> (ø)
warehouse/schema/schema.go	96.00% <92.59%> (ø)
... and 11 more

... and 12 files with indirect coverage changes

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[achettyiitr]

Currently, it depends on #3773, Since schema will create circular dependency w.r.t warehouse and router package.