lints: enable clippy all/cargo/pedantic groups, mirroring uutils/coreutils

Enable the broader clippy lint set used by uutils/coreutils (the all,
cargo and pedantic groups plus the use_self nursery lint), allowing the
noisy/low-value lints. The preceding commits fix the warnings these
groups surface so the tree stays warning-free.

Cargo.toml

@@ -77,17 +77,43 @@ inherits = "release"
 panic = "abort"
 
 [lints.clippy]
+all = { level = "warn", priority = -1 }
+cargo = { level = "warn", priority = -1 }
+pedantic = { level = "warn", priority = -1 }
+use_self = "warn" # nursery lint
+
+# Group-level allows for lints that are too noisy or not worth enforcing for now.
 multiple_crate_versions = "allow"
 cargo_common_metadata = "allow"
 uninlined_format_args = "allow"
+missing_errors_doc = "allow"
 missing_panics_doc = "allow"
-
-use_self = "warn"
-needless_pass_by_value = "warn"
-semicolon_if_nothing_returned = "warn"
-single_char_pattern = "warn"
-explicit_iter_loop = "warn"
-if_not_else = "warn"
-manual_let_else = "warn"
+must_use_candidate = "allow"
+match_same_arms = "allow"
+cast_possible_truncation = "allow"
+too_many_lines = "allow"
+cast_possible_wrap = "allow"
+cast_sign_loss = "allow"
+struct_excessive_bools = "allow"
+cast_precision_loss = "allow"
+cast_lossless = "allow"
+ignored_unit_patterns = "allow"
+similar_names = "allow"
+float_cmp = "allow"
+return_self_not_must_use = "allow"
+inline_always = "allow"
+fn_params_excessive_bools = "allow"
+used_underscore_items = "allow"
+should_panic_without_expect = "allow"
+doc_markdown = "allow"
+unused_self = "allow"
+enum_glob_use = "allow"
+unnested_or_patterns = "allow"
+implicit_hasher = "allow"
+doc_link_with_quotes = "allow"
+format_push_string = "allow"
+flat_map_option = "allow"
+from_iter_instead_of_collect = "allow"
+large_types_passed_by_value = "allow"
 # Disable for now, we have a few occurrences
 # panic = "warn"