goal: Add export and import options for genesis files during network creation

[algochoi]

Summary

Generating part keys (particularly falcon keys) is on the critical path when creating new private networks. This PR provides an option to export and import files like genesis.json, root and participation keys to speed that up.

Adds a new command to goal to export genesis files:

• goal network pregen [-p] [-t]: Generates genesis.json, root and part keys based on the template file [-t]. [-p] is where the genesis files are saved (since this is an inherited required flag), and it must be empty or command will error.

Adds a new flag to import genesis files:

• goal network create [-r] [-t] [-p]: Imports files from pregendir to networkDir. Importing keys was already possible, but this explicitly copies over the keys from another directory, because network directories are wiped if there is an error during creation.

Some small benchmarks experiment to estimate start-up time savings: https://gist.github.com/algochoi/53af36bc5d0356124098ffe2c0967b3e

#4826

Test Plan

Manually tested that importing large number of rounds saves time, checked partkeys using: goal account partkeyinfo -d ${NETROOTPATH}/{WALLET}

Added a e2e test.

[codecov]

Codecov Report

Merging #5672 (a45062f) into master (b0cf5c8) will increase coverage by 1.17%.
The diff coverage is 24.19%.

@@            Coverage Diff             @@
##           master    #5672      +/-   ##
==========================================
+ Coverage   54.31%   55.48%   +1.17%     
==========================================
  Files         474      474              
  Lines       66416    66471      +55     
==========================================
+ Hits        36075    36884     +809     
+ Misses      27839    27077     -762     
- Partials     2502     2510       +8     

Files Changed	Coverage Δ
netdeploy/network.go	9.29% <0.00%> (ø)
cmd/goal/network.go	15.95% <21.05%> (+1.13%)	⬆️
netdeploy/networkTemplate.go	40.58% <100.00%> (ø)

... and 80 files with indirect coverage changes

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[tzaffi]

This change is great and it will have a great impact for projects that use private networks.

I left one nit regarding the usage of -r in the context of goal network genesis which seems a bit confusing to me. Maybe this was motivated by -r being required for goal network. Some options (other than keeping things as is) are to not mark it as required, but then add checks to all the other goal network commands enforcing its presence, or to carve out a new goal genesis command.

[tzaffi]

LGTM

[algorandskiy]

Tested, updated the PR description to match cli switches