goal: Add initialize option to 'goal node catchup'.

[winder]

Summary

Add new parameter from #5752 to goal node catchup.

Minor refactoring to command to try and simplify the operations. In particular things I didn't like:

• referencing args[0] without saying anywhere that it was an optional positional argument.
• the catchup function references global abort flag, which is also referenced in the cobra function.
• multiple client objects created.

Test Plan

Manually tested a bunch of permutations:

goal node catchup
goal node catchup -x
goal node catchup --force
goal node catchup --force -i 100000000
goal node catchup -i 100000000
goal node catchup -i 1000
goal node catchup -i 1000 --force
goal node catchup --force 
goal node catchup 29900000#K35DLY2QEMR6LPL6GOM5XR4ZVDYBNQ34TOWZVOPPL6PHSQGJJXHA
goal node catchup -i 100000000 29900000#K35DLY2QEMR6LPL6GOM5XR4ZVDYBNQ34TOWZVOPPL6PHSQGJJXHA
goal node catchup -i 100000000 --force 29900000#K35DLY2QEMR6LPL6GOM5XR4ZVDYBNQ34TOWZVOPPL6PHSQGJJXHA
goal node catchup -i 10000 29900000#K35DLY2QEMR6LPL6GOM5XR4ZVDYBNQ34TOWZVOPPL6PHSQGJJXHA --force
goal node catchup -i 10000 --force 29900000#K35DLY2QEMR6LPL6GOM5XR4ZVDYBNQ34TOWZVOPPL6PHSQGJJXHA --force

[codecov]

Codecov Report

Merging #5754 (5226539) into master (17871a3) will decrease coverage by 0.01%.
The diff coverage is 4.76%.

@@            Coverage Diff             @@
##           master    #5754      +/-   ##
==========================================
- Coverage   55.45%   55.44%   -0.01%     
==========================================
  Files         473      473              
  Lines       66683    66682       -1     
==========================================
- Hits        36979    36972       -7     
- Misses      27184    27189       +5     
- Partials     2520     2521       +1     

Files	Coverage Δ
libgoal/libgoal.go	2.44% <0.00%> (+0.01%)	⬆️
cmd/goal/node.go	12.65% <5.55%> (+0.18%)	⬆️

... and 15 files with indirect coverage changes

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[algorandskiy]

The code LGTM, the new param name - maybe there are better options.