feat: add load older transactions on Nano Contract Details screen

[alexruzenhack]

Acceptance Criteria

• Add 'Load More' in the footer of transactions list, which triggers the request for older transactions when pressed
• Hides the 'Load More' button when the last transaction of the list is the 'initialize'

Loading older transactions

nc-load-more-older-txs.mp4

The video above shows a list of transactions initialized in the newest transaction only. When the button 'Load More' is pressed a list of older transactions is loaded. The button 'Load More' didn't show after load because the list has reached its end.

Security Checklist

• Make sure you do not include new dependencies in the project unless strictly necessary and do not include dev-dependencies as production ones. More dependencies increase the possibility of one of them being hijacked and affecting us.

[alexruzenhack]

I'm closing this PR to concentrate only on #512. I've incorporated all commits of this PR there.