refactor: extract CLI flag types into deno_cli_parser crate (#35333)
This is the first step in splitting the effort to replace clap with a
zero-cost CLI argument parser (originally proposed as one ~35k-line
change in #33325) into small, independently reviewable pieces that can
land one at a time.
This change introduces a new `libs/cli_parser` (`deno_cli_parser`)
crate that holds the canonical CLI flag type definitions: `Flags`,
`DenoSubcommand`, `PermissionFlags`, every `*Flags` struct/enum, and
their pure data impls. `cli/args/flags.rs` now re-exports those types
via `pub use deno_cli_parser::flags::*` and keeps all of its existing
clap-based parsing untouched. It is a pure refactor with no behavior
change: clap still does all argument parsing, only the type definitions
moved. This gives later PRs a place to grow the actual parser without
touching the CLI's parsing path yet.
A handful of helper methods cannot live in the parser crate because
they depend on clap, deno_graph, deno_telemetry, or the CLI build
environment (`env!("TARGET")`), so they become extension traits in
`cli/args/flags.rs` (`FileFlagsExt`, `CompileFlagsExt`,
`DenoSubcommandExt`, `TypeCheckModeExt`, `FlagsExt`) and consumers gain
the matching imports. `HelpFlags.help` changes from
`clap::builder::StyledStr` to `String` (the ansi-rendered string is
stored at construction) so the crate stays clap-free, and the
`From<BundleOptions>` conversion moves next to `BundleFlags` to satisfy
the orphan rule.
deno
85b4cb5f - refactor: extract CLI flag types into deno_cli_parser crate (#35333)
