Support pre and post compile components

[ramaro]

Support pre and post compile components

We should allow the definition of a pre and post compile components to perform the following:

• Before the inventory is rendered, run pre compile component
• After the inventory is rendered, run post component
• Pre and post compile components will not be associated to any targets.
• it should use the exact structure, input and output types of the kapitan inventory compile structure.

cc @Moep90

[jkrzemin]

Sorry, copied wrong issue number while creating the PR. I would like to tackle this one though.

[github-actions]

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