added scheduler config logging on bootstrap

[nirrozenbaum]

This PR adds logging of the scheduler config on bootstrap, using String() function on SchedulerConfig and SchedulerProfile.
before this change, there was a log line setupLog.Info("Configuration file loaded", "config", config) that was logging nothing, the output in the log was something like &EndpointPickerConfig{}.

After this change, it's very clear what is the scheduler config that is being used.
Tested this change for both canned configurations.
output of default-plugins.yaml:

{"level":"info","ts":"2025-07-28T17:58:58Z","logger":"setup","caller":"runner/runner.go:321","msg":"parsed 
config","scheduler-config":"{ProfileHandler: single-profile-handler/single-profile-handler, Profiles: map[default:{Filters: [low-
queue-filter/low-queue-filter], Scorers: [], Picker: random-picker/random-picker, PostCyclePlugins: []}]}"}

output of plugins-v2.yaml:

{"level":"info","ts":"2025-07-28T17:49:58Z","logger":"setup","caller":"runner/runner.go:321","msg":"parsed 
config","scheduler-config":"{ProfileHandler: single-profile-handler/single-profile-handler, Profiles: map[default:{Filters: [], 
Scorers: [queue-scorer/queue-scorer: 1, kv-cache-scorer/kv-cache-scorer: 1, prefix-cache-scorer/prefix-cache-scorer: 1], 
Picker: max-score-picker/max-score-picker, PostCyclePlugins: [prefix-cache-scorer/prefix-cache-scorer]}]}"}

cc: @ahg-g @shmuelk @kfswain @elevran

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This pull-request has been approved by: nirrozenbaum

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[nirrozenbaum]

just as a clarification, when you see a plugin logged the format is of TypedName, that is <Name>/<Type>.
in the canned configurations no names are specified so all names are defaulted to the corresponding types.

[kfswain]

/lgtm

[kfirtoledo]

+1