Increase size of exiRequest/exiResponse (or make it configurable).

[tmdiv]

According to the OCPP specifications, the exiRequest/exiResponse fields are defined as strings with a maximum length of 0 to 5600 characters.

However, organizations such as Hubject, which holds the V2G Root CA, have indicated that this limit may be insufficient and advocate for a larger size, for example, up to 7500 characters. Could you please consider increasing the maximum size of these fields or implementing a configurable option to accommodate such requirements?

https://support.hubject.com/hc/en-us/articles/9205599966749-3-7-Requirements-for-EVSE