Expand `InputType` with new variant: Bolt12 offer #3787

Job	Run time
Test sdk-common	43s
Test sdk-bindings	2m 36s
Test sdk-core	1m 8s
Test sdk-cli	1m 2s
Clippy	59s
Check SDK as Rust dependency in fresh project	2m 51s
Check flutter	2m 44s
Check react native	1m 10s
Format	9s
	13m 22s

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