Ability to add context values

[nejtr0n]

Checklist

• [x] Are you running the latest v3 release? The list of releases is here.
• [x] Did you check the manual for your release? The v3 manual is here.
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What problem does this solve?

In old versions we could add context fields in Before function like this

  Before: func(c *cli.Context) error {
      db := "example"
      c.Context = context.WithValue(c.Context, "db", db)
      return nil
  },

It's useful for example for passing logger through all commands.

Solution description

Add some middleware layer to command with signature

func(ctx context.Context, command *cli.Command) func(ctx context.Context, command *cli.Command)

where we could modify passing ctx

Describe alternatives you've considered

Return back Context field to command