Add consistent progress bars for syncing

[benaadams]

Changes

• Rather than just Snap having a progress bar; also have progress bar for Downloads, Old headers, Old Bodies and Old Receipts
• Split each char of the progress bar into 8 elements for higher precision in same chars
  '⡀', '⡄', '⡆', '⡇', '⣇', '⣧', '⣷', '⣿'
• Output multi-line branch sync logs a max of every 10 sec
• If log to be output is same as previous log, skip it
• Only output one line for sync change (Move "Sync mode changed" to Debug)
• Bring block etc to first element on sync change log

Before

After

Types of changes

What types of changes does your code introduce?

• Other: Logging

Testing

Requires testing

• No

[LukaszRozmej]

I wonder if we started using some Pool of StringBuilders instead of string interpolation, would we reduce memory allocations significantly?

[benaadams]

I wonder if we started using some Pool of StringBuilders instead of string interpolation, would we reduce memory allocations significantly?

C#10 made string interpolation good https://devblogs.microsoft.com/dotnet/string-interpolation-in-c-10-and-net-6/