Move more code out of internal

[mozesl-nokia]

Follow up to #4490

Currently moved:

• internal/types -> pkg/lib/types (this is a revert)
• internal/pkg -> pkg/lib/pkg
• internal/alpha/printers/table -> pkg/printer/table
• internal/builtins/pkg_context.go -> pkg/lib/builtins/pkg_context.go (builtins already existed here)
• internal/util/update/ -> pkg/lib/update (merged the two packages)
• internal/utils/update/merge3 -> pkg/lib/update/merge3
• removed internal/util/merge
• internal/util/render -> pkg/lib/kptops (renamed executor.go to render_executor.go)
• internal/util/diff -> pkg/lib/pkg/diff
• internal/util/pkgutil -> pkg/lib/pkg
• internal/util/attribution -> pkg/lib/util/attribution
• internal/util/stack -> pkg/lib/util/stack
• internal/util/strings -> pkg/lib/util/strings
• internal/util/printerutil -> pkg/printer
• internal/util/argutil -> pkg/lib/util/args
• internal/util/fetch -> pkg/lib/util/fetch
• internal/util/get -> pkg/lib/util/get
• internal/util/git -> pkg/lib/util/git
• internal/util/man -> pkg/lib/util/man
• internal/util/pathutil -> pkg/lib/util/path
• internal/hook -> pkg/lib/kptops (renamed executor.go to hook_executor.go)

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