Add Money.with_bank for Dynamic Currency Stores

[pranavbabu]

After some #discussions with @yukideluxe it seems like this library is a better place for this #PR.

This PR introduces the Money.with_bank method, allowing developers to assign different currency stores (banks) dynamically within a scoped block. This is particularly useful for loading custom exchange rates per user session.

Key Changes

• Implemented Money.with_bank(bank_instance), enabling temporary overrides of the default bank.
• Ensures thread safety by restoring the original bank after execution.

[sunny]

Much better indeed, love the addition of the spec for thread-safety as well.

[sunny]

Can you add a CHANGELOG entry? 🙏🏻

[pawelma]

I like the addition, left some comments, mostly nitpicky 😅

[yukideluxe]

sorry the delay! thanks for all the changes! this gem uses rbs for typing the method. Would you mind adding that in a similar fashion to

money/sig/lib/money/money.rbs

Lines 221 to 234 in 377b0e8

	# Temporarily changes the rounding mode in a given block.
	#
	# @param [BigDecimal::ROUND_MODE] mode
	#
	# @yield The block within which rounding mode will be changed. Its return
	# value will also be the return value of the whole method.
	#
	# @return [Object] block results
	#
	# @example
	# fee = Money.with_rounding_mode(BigDecimal::ROUND_HALF_DOWN) do
	# Money.new(1200) * BigDecimal('0.029')
	# end
	def self.with_rounding_mode: (untyped mode) { () -> untyped } -> untyped

🙏🏻

last thing and I meeeergeeeee

[pranavbabu]

@yukideluxe Lets hope I've done it right :D

[yukideluxe]

looks good to me! thanks! 🙏🏻