chore: new flag export only header bytes

[RafilxTenfen]

Created new structure to avoid exporting params: [] empty as it was before by using the bbnbtclightclienttypes.GenState as before

Add new flag with-height to btc-headers command

[gitferry]

From babylonlabs-io/babylon#4, I understand that we do not want work in the output right? Why not just remove it other than have a flag?

[RafilxTenfen]

integration tests pass locally

[RafilxTenfen]

From babylonlabs-io/babylon#4, I understand that we do not want work in the output right? Why not just remove it other than have a flag?

Well, I thought since it was already done I left the option to export all fields and we could use to confirm some values if needed, but if you prefer to remove it I can remove it entirely @gitferry

[gitferry]

Let's remove work entirely as the calculation should be done in Babylon side. We can also remove hash as this can be obtained from the bytes. This leaves height and bytes. If we want to keep the option of having height, maybe we can have a flag called with-height other than only-header-bytes. This way, for preparing upgrade, we don't need to specify any flag

[gitferry]

Code-wise lgtm, not sure why e2e failed though

[gitferry]

CI fixed in #14