feat: Add a config option to set the vlog max file size

[fredcarle]

Relevant issue(s)

Resolves #742

Description

This PR adds a config option that gives the user the ability to set the maximum value log file size for the badger DB datastore.

Tasks

• I made sure the code is well commented, particularly hard-to-understand areas.
• I made sure the repository-held documentation is changed accordingly.
• I made sure the pull request title adheres to the conventional commit style (the subset used in the project can be found in tools/configs/chglog/config.yml).
• I made sure to discuss its limitations such as threats to validity, vulnerability to mistake and misuse, robustness to invalidation of assumptions, resource requirements, ...

How has this been tested?

unit test and manual test

Specify the platform(s) on which this was tested:

• MacOS

[codecov]

Codecov Report

Merging #743 (cf2a0a1) into develop (f6ed210) will increase coverage by 0.14%.
The diff coverage is 93.93%.

@@             Coverage Diff             @@
##           develop     #743      +/-   ##
===========================================
+ Coverage    57.52%   57.66%   +0.14%     
===========================================
  Files          143      143              
  Lines        16394    16456      +62     
===========================================
+ Hits          9430     9489      +59     
- Misses        6081     6083       +2     
- Partials       883      884       +1     

Impacted Files	Coverage Δ
config/configfile.go	75.00% <ø> (ø)
cli/start.go	16.75% <62.50%> (+1.99%)	⬆️
config/config.go	79.03% <98.27%> (+4.42%)	⬆️

[jsimnz]

Does the current config file with this PR still include the double options yaml values?

Some minor suggestions, thoughts. Should be quick to get it to final approval state.

[jsimnz]

👍