Add saveMultiple() method to FixedRates exchanger plugin [#3523945]

Problem/Motivation

Currently, the FixedRates exchanger plugin does not provide a method to save multiple exchange rates at once. This can lead to inefficient code when updating many rates, as each must be saved individually.

Steps to reproduce

Proposed resolution

Introduce a new method saveMultiple(array $newRates) in the FixedRates exchanger plugin. This method will allow batch updating of exchange rates by modifying the configuration in one operation.

Remaining tasks

User interface changes

API changes

Data model changes

Comment	File	Size	Author
#6	3523945-refactor-save-multiple-3.patch	3.14 KB	super_romeo

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3523945-Add-save-multiple changes, plain diff MR !12
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3523945-refactor-save-multiple changes, plain diff MR !8
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