feat: add per-event retry and backoff for queued broadcasts

[goravel-coder]

Summary

• Queued broadcasts can now declare a per-event retry policy: BroadcastTries() sets the maximum attempts and BroadcastBackoff() sets the delay before each retry.
• BroadcastJob now implements queue.JobWithShouldRetry, so retries are driven by the event's own policy instead of the queue worker's global tries config; broadcasts without BroadcastTries remain single-shot.
• Added the ShouldBroadcastWithTries / ShouldBroadcastWithBackoff optional event interfaces (with regenerated mocks) so the retry policy is captured at dispatch time and enforced at execution time.

Why

Previously a queued broadcast's retry behavior was fixed by the queue worker's global tries setting, giving every broadcast job the same retry count and no way to schedule per-attempt delays. This made transient driver failures (e.g. a briefly-unavailable Pusher/Redis connection) hard to handle: either everything retried aggressively or nothing did, with no backoff between attempts.

This change lets each broadcast event opt into its own retry policy at the dispatch site, mirroring how Goravel already lets events control their queue, connections, delay, timeout, and sync/async behavior. Backoff is applied per attempt with the last value repeating, matching Laravel's backoff semantics. Events that do not implement the new interfaces keep the existing single-shot behavior, so this is fully backward compatible.

type OrderShippedBroadcast struct {
	OrderData map[string]any
}

func (e *OrderShippedBroadcast) BroadcastOn() []contracts.Channel {
	return []contracts.Channel{broadcasting.PublicChannel("orders")}
}

func (e *OrderShippedBroadcast) BroadcastAs() string {
	return "order.shipped"
}

func (e *OrderShippedBroadcast) BroadcastWith() map[string]any {
	return map[string]any{"order": e.OrderData}
}

func (e *OrderShippedBroadcast) BroadcastWhen() bool {
	return true
}

// Retry up to 3 times; wait 1s, then 2s before the remaining attempts.
func (e *OrderShippedBroadcast) BroadcastTries() int {
	return 3
}

func (e *OrderShippedBroadcast) BroadcastBackoff() []time.Duration {
	return []time.Duration{time.Second, 2 * time.Second}
}

[codecov]

Codecov Report

❌ Patch coverage is 93.18182% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 69.79%. Comparing base (0c23dc0) to head (2aa82fd).
⚠️ Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
broadcasting/job.go	91.42%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1529      +/-   ##
==========================================
- Coverage   69.81%   69.79%   -0.02%     
==========================================
  Files         396      409      +13     
  Lines       30761    31344     +583     
==========================================
+ Hits        21476    21877     +401     
- Misses       8278     8435     +157     
- Partials     1007     1032      +25     

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