New helper collection channel

[samber]

Let's talk about a new suite of helpers for manipulating channels.

// ToChannel returns a read-only channels of collection elements.
func ToChannel[T any](collection []T) <-chan T

// Generator implements the generator design pattern.
func Generator[T any](bufferSize int, generator func(int64) T) <-chan T

// Batch creates a slice of n elements from a channel. Returns the slice and the slice length.
func Batch[T any](ch <-chan T, size int) (collection []T, length int)

// BatchWithTimeout creates a slice of n elements from a channel, with timeout. Returns the slice and the slice length.
func BatchWithTimeout[T any](ch <-chan T, size int, timeout time.Duration) (collection []T, length int)

Some thoughts about BatchXXX functions:

• return channel status: ok bool?
• return batch time: duration time.Duration?
• return <-chan []T instead of []T ?
• accept a buffer as a parameter instead of repeated allocation?
• allocate channel with buffer size > 1 ?

[samber]

Some ideas in following PR: #95