Fix absolute path issue and add export-json flag

[ishantiw]

What was the problem?

This PR resolves #9013 #9019

How was it solved?

♻️ Manage different file paths #9013 and 🌱 add export-json flag #9019

How was it tested?

• ./bin/run init ~/Desktop/pathTest
• cd pathTest
• copy paste commander/dist/bootstrapping/commands/genesis-block/create.js from commander into your newly built pathTest app node_modules/lisk-commander/dist/bootstrapping/commands/genesis-block/create.js
• Run multiple formats of data path into genesis-block:create command
  • ./bin/run genesis-block:create --output ../ --assets-file config/default/genesis_assets.json
  • ./bin/run genesis-block:create --output ~/Desktop --assets-file config/default/genesis_assets.json
  • ./bin/run genesis-block:create --output /User/username/Desktop/pathTest/config/default --assets-file config/default/genesis_assets.json
    and check whether it is creating the file at the desired location
• Check if the JSON format is exported on using --export-json flag : ./bin/run genesis-block:create --output ../ --assets-file config/default/genesis_assets.json --export-json

[codecov]

Codecov Report

Merging #9020 (b2779e1) into release/6.0.0 (5e6cf7c) will decrease coverage by 0.03%.
The diff coverage is 22.22%.

@@                Coverage Diff                @@
##           release/6.0.0    #9020      +/-   ##
=================================================
- Coverage          83.55%   83.53%   -0.03%     
=================================================
  Files                603      603              
  Lines              22661    22668       +7     
  Branches            3348     3351       +3     
=================================================
+ Hits               18934    18935       +1     
- Misses              3727     3733       +6     

Files Changed	Coverage
...src/bootstrapping/commands/genesis-block/create.ts	22.22%