Expose WorkflowLockTimeout and ActivityLockTimeout options

[Copilot]

This PR exposes the WorkflowLockTimeout and ActivityLockTimeout configuration options by adding corresponding With* option functions to the backend package.

Problem

The Options struct in backend/options.go already contained WorkflowLockTimeout and ActivityLockTimeout fields with default values (1 minute and 2 minutes respectively), but there was no way for users to customize these timeouts when creating backend instances. Users could only use the hardcoded default values.

Solution

Added two new option functions following the existing pattern:

func WithWorkflowLockTimeout(timeout time.Duration) BackendOption {
    return func(o *Options) {
        o.WorkflowLockTimeout = timeout
    }
}

func WithActivityLockTimeout(timeout time.Duration) BackendOption {
    return func(o *Options) {
        o.ActivityLockTimeout = timeout
    }
}

Usage

Users can now customize these timeouts when configuring backends:

import "github.com/cschleiden/go-workflows/backend"

opts := backend.ApplyOptions(
    backend.WithWorkflowLockTimeout(5*time.Minute),
    backend.WithActivityLockTimeout(10*time.Minute),
)

Testing

• Added comprehensive unit tests covering individual usage, combined usage, and integration with existing options
• Verified all existing tests continue to pass
• Tested integration with monoprocess backend (12+ seconds of tests pass)
• Confirmed the functions work correctly when imported from external packages

The changes are minimal and surgical - just 12 lines of new production code following the exact same pattern as existing option functions like WithStickyTimeout, WithLogger, etc.

Fixes #403.

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