scheduler: revise reservation and add preallocation api

[saintube]

Ⅰ. Describe what this PR does

1. Add PreAllocation API.
2. Revise the logic of the reservation plugin for readability and efficiency.
3. Add the feature SyncReservationDeletion to sync the reservation-allocated annotation of owner pods when a reservation is deleted. It is safe to get backward compatible when the feature is disabled.

Ⅱ. Does this pull request fix one issue?

Part of #2150.

Ⅲ. Describe how to verify it

Ⅳ. Special notes for reviews

V. Checklist

• I have written necessary docs and comments
• I have added necessary unit tests and integration tests
• All checks passed in make test

[codecov]

Codecov Report

Attention: Patch coverage is 58.70021% with 197 lines in your changes missing coverage. Please review.

Project coverage is 65.93%. Comparing base (af357ca) to head (767e9c4).

Files with missing lines	Patch %	Lines
...plugins/reservation/controller/pod_eventhandler.go	63.55%	39 Missing and 4 partials ⚠️
...scheduler/plugins/reservation/reservation_state.go	18.75%	38 Missing and 1 partial ⚠️
pkg/scheduler/plugins/reservation/cache.go	64.36%	27 Missing and 4 partials ⚠️
...duler/plugins/reservation/controller/controller.go	61.42%	19 Missing and 8 partials ⚠️
.../frameworkext/eventhandlers/reservation_handler.go	46.66%	15 Missing and 1 partial ⚠️
pkg/scheduler/plugins/reservation/transformer.go	69.76%	7 Missing and 6 partials ⚠️
pkg/scheduler/frameworkext/reservation_info.go	0.00%	8 Missing ⚠️
...reservation/controller/reservation_eventhandler.go	61.53%	4 Missing and 1 partial ⚠️
pkg/scheduler/plugins/reservation/nominator.go	75.00%	4 Missing and 1 partial ⚠️
pkg/util/reservation/reservation.go	16.66%	4 Missing and 1 partial ⚠️
... and 2 more

❌ Your patch check has failed because the patch coverage (58.70%) is below the target coverage (70.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2329      +/-   ##
==========================================
- Coverage   65.94%   65.93%   -0.02%     
==========================================
  Files         466      467       +1     
  Lines       54879    55109     +230     
==========================================
+ Hits        36191    36334     +143     
- Misses      16074    16151      +77     
- Partials     2614     2624      +10     

Flag	Coverage Δ
unittests	65.93% <58.70%> (-0.02%)	⬇️

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