chore: more clippy rules 2 (#4057)

The only file to watch is the cargo.toml
All the others come from just fix + a few manual small fix

The set of rules have been taken from the list of clippy rules
arbitrarily while trying to optimise the learning and style of the code
while limiting the loss of productivity

codex-rs/Cargo.toml

@@ -152,8 +152,35 @@ rust = {}
 
 [workspace.lints.clippy]
 expect_used = "deny"
+identity_op = "deny"
+manual_clamp = "deny"
+manual_filter = "deny"
+manual_find = "deny"
+manual_flatten = "deny"
+manual_map = "deny"
+manual_memcpy = "deny"
+manual_non_exhaustive = "deny"
+manual_ok_or = "deny"
+manual_range_contains = "deny"
+manual_retain = "deny"
+manual_strip = "deny"
+manual_try_fold = "deny"
+manual_unwrap_or = "deny"
+needless_borrow = "deny"
+needless_borrowed_reference = "deny"
+needless_collect = "deny"
+needless_late_init = "deny"
+needless_option_as_deref = "deny"
+needless_question_mark = "deny"
+needless_update = "deny"
 redundant_clone = "deny"
+redundant_static_lifetimes = "deny"
+trivially_copy_pass_by_ref = "deny"
 uninlined_format_args = "deny"
+unnecessary_filter_map = "deny"
+unnecessary_lazy_evaluations = "deny"
+unnecessary_sort_by = "deny"
+unnecessary_to_owned = "deny"
 unwrap_used = "deny"
 
 # cargo-shear cannot see the platform-specific openssl-sys usage, so we