feat. Oclif v2 migration

[florind-ens]

Description

Migrating to @oclif/core from the old oclif libraries, according to Oclif v2 migration guide: https://github.com/oclif/core/blob/main/MIGRATION.md

Related Issue

Motivation and Context

How Has This Been Tested?

Screenshots (if appropriate):

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [x] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [x] I have signed the Adobe Open Source CLA.
• [x] My code follows the code style of this project.
• [x] My change requires a change to the documentation.
• [x] I have updated the documentation accordingly.
• [x] I have read the CONTRIBUTING document.
• [x] I have added tests to cover my changes.
• [x] All new and existing tests passed.

[codecov[bot]]

Codecov Report

Merging #171 (98f7e0a) into master (95c9431) will not change coverage. The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #171   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           18        18           
  Lines          524       519    -5     
  Branches        75        75           
=========================================
- Hits           524       519    -5     

Impacted Files	Coverage Δ
src/commands/console/index.js	100.00% <100.00%> (ø)
src/commands/console/org/index.js	100.00% <100.00%> (ø)
src/commands/console/org/list.js	100.00% <100.00%> (ø)
src/commands/console/org/select.js	100.00% <100.00%> (ø)
src/commands/console/project/index.js	100.00% <100.00%> (ø)
src/commands/console/project/list.js	100.00% <100.00%> (ø)
src/commands/console/project/select.js	100.00% <100.00%> (ø)
src/commands/console/publickey/delete.js	100.00% <100.00%> (ø)
src/commands/console/publickey/index.js	100.00% <100.00%> (ø)
src/commands/console/publickey/list.js	100.00% <100.00%> (ø)
... and 6 more

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