chore(cardano): add changelog entries

core/.changelog.d/1683.changed.1

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+Thanks to transaction streaming, Cardano now supports larger transactions (tested with 62kB transactions, but supposedly even larger transactions are supported)

core/.changelog.d/1683.changed.2

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+Cardano transaction parameters are now streamed into the device one by one instead of being sent as one large object

core/.changelog.d/1683.fixed.4

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+It is no longer possible to sign Cardano transactions containing paths belonging to multiple accounts (except for Byron to Shelley migration)

core/.changelog.d/1683.incompatible.3

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+Due to transaction streaming in Cardano, it isn't possible to return the whole serialized transaction anymore. Instead the transaction hash, transaction witnesses and auxiliary data supplement are returned and the serialized transaction needs to be assembled by the client.

python/.changelog.d/1683.changed.1

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+Cardano transaction parameters are now streamed into the device one by one instead of being sent as one large object

python/.changelog.d/1683.incompatible.2

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+Due to transaction streaming in Cardano, it isn't possible to return the whole serialized transaction anymore. Instead the transaction hash, transaction witnesses and auxiliary data supplement are returned and the serialized transaction needs to be assembled by the client.