fix(protocol): change to transfer and mint pattern with BridgedERC20 tokens

[adaki2004]

@dantaik This is the one with "transfer and burn" functionality. The original burn() function also stayed as is, because during token migration, that one will be used by end-users - but Vault uses know the same burn(uint) interface as USDC.

One important side-note to @KorbinianK is, that since we dont burn directly but transfer AND burn, an approval is now again required to bridge back the bridged tokens !

[openzeppelin-code]

fix(protocol): change to transfer and mint pattern with BridgedERC20 tokens

Generated at commit: d2827252aad9aafbba284ceeda33c1be96163f5a

🚨 Report Summary

	Severity Level	Results
Contracts	Critical High Medium Low Note Total	2 2 0 4 39 47
Dependencies	Critical High Medium Low Note Total	0 0 0 0 0 0

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[adaki2004]

@dantaik if urgent please proceed with the changes. I'm currently alone with the kid, cannot code in the next 3 hours.