fix: FoE request length check

[SebastianKoopmann]

Change length check error reaction.
Length check for each opcode added based on FoE state machine within ETG1000.6.
(Also included: Pull-Request #194, #197 and #198)

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❌ whoTBecker
❌ whoMBadura
❌ ule29147
❌ SebastianKoopmann
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