Allow more hardware signer addresses about frame

[IgnorantFoolio]

Big upvote for this. I work with many addresses on a regular basis. I separate addresses for the following reasons:

1. Accounting/bookkeeping - It is easier for me to keep track of what I was doing and follow the trail of coins if I use different addresses for different purposes.
2. Privacy - Separate addresses for different purposes can also provide some level of privacy protection. Assets aren't all together, and I don't create a profile for my blockchain activities all in a single address.
3. Work - I work in the Ethereum ecosystem, and I go through many addresses on mainnet and testnets.

Right now I have at least two hardware wallets with 50+ addresses in use, and one wallet with 100+ addresses in use, and growing. For one hardware wallet, all addresses are in use a few times per year. For another, I may use older addresses less frequently. But I need to be able to pull any address up at any time, because I find that some of my oldest addresses are now eligible for airdrops, POAPs. etc.

This is a deal-breaking issue for me. My daily driver addresses are all completely inaccessible in Frame. Until Frame supports at least 100 addresses on a hardware wallet, I will have to continue to use my existing wallet, which has the most painful UI for this number of addresses.