Consolidate Bolt12 parsing into sdk-common

[ok300]

The input_parser lives in sdk-common, however the logic to parse Bolt12 offers exists only in the Liquid SDK.

This separation was done because the parsing logic required lightning of at least version 0.0.125. Once gl-client supports it, we can move this custom parsing logic back into sdk-common.

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Depends on

• gl-client: Bump lightning dependency to 0.0.125 or higher Blockstream/greenlight#542
  • this will likely also bump lightning-invoice, bitcoin

Next steps

• GL SDK: bump gl_client to include the above
• breez-sdk-liquid: bump sdk-common dependency to use the above
• breez-sdk-liquid: remove custom lightning dependency, re-use the one from sdk-common (which is a re-export of the gl_client one)
• breez-sdk-liquid: move logic for parsing Bolt12 offers (introduced in Add support for paying to BOLT12 #549) into sdk-common