fix: return ErrMessageSizeTooLarge when message is too large #2851
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For most of this library's existence it has returned ErrMessageSizeTooLarge when the message exceeded the configured size.
For a short period in 2019 this error was renamed (#1218) but shortly revered back (#1262). Later in 2023 this error was changed to a ConfigurationError (#2628) to fix #2137, however this has caused issues with clients who rely on the previous error code being distinct from other ConfigurationError conditions (#2655).
This commit reverts to previous behaviour, and adds a test to pickup if this changes again in the future.