Upgrade Oclif for conditional fields

[jonaslagoni]

Reason/Context

For the generate models command, there are specific arguments that must be provided based on the condition of the language output:

cli/src/commands/generate/models.ts

Line 69 in cfbd536

throw new Error('In order to generate models to C#, we need to know which namespace they are under. Add `--namespace=NAMESPACE` to set the desired namespace.');

This was previously not supported by Oclif but now it is: oclif/oclif#323

This means that we can remove those custom checks and instead make the check in Oclif directly.

Description

Upgrade Oclif and refactor generate models to use the new conditional checks.

[Souvikns]

I don't think this helps in our case. So we enable packageName flag when we have java as an argument for language.Currently I can check only for flags and there is no support for checking arguments.

[github-actions]

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[derberg]

I guess we can close, looking at the answer from @Souvikns

@jonaslagoni if you disagree please let us know and I will reopen