Expose access to progress on f3 runner

[masih]

The root F3 instance holds reference to the gpbftRunner, not gpbftHost. To allow access to current progress from Lotus, move the Progress implementation to runner and expose at root F3 type.

Part of #599

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 6 lines in your changes missing coverage. Please review.

Project coverage is 76.27%. Comparing base (70ae074) to head (b15c886).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
f3.go	0.00%	4 Missing ⚠️
host.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #673      +/-   ##
==========================================
- Coverage   76.41%   76.27%   -0.14%     
==========================================
  Files          65       65              
  Lines        5388     5392       +4     
==========================================
- Hits         4117     4113       -4     
- Misses        877      884       +7     
- Partials      394      395       +1     

Files with missing lines	Coverage Δ
host.go	69.52% <0.00%> (-0.24%)	⬇️
f3.go	62.61% <0.00%> (-1.15%)	⬇️

... and 3 files with indirect coverage changes

[Stebalien]

LGTM but needs a rebase.