perf: fix memory leaks, optimize tracing logs, fix networking eof fragmentation bug in nvim-core and stub, and deduplicate json-rpc handlers

server/src/handlers/utils.rs

@@ -0,0 +1,15 @@
+pub fn contains_ignore_ascii_case(haystack: &str, needle: &str) -> bool {
+    if needle.is_empty() {
+        return true;
+    }
+    haystack
+        .as_bytes()
+        .windows(needle.len())
+        .any(|w| w.eq_ignore_ascii_case(needle.as_bytes()))
+}
+pub fn now_secs() -> u64 {
+    std::time::SystemTime::now()
+        .duration_since(std::time::UNIX_EPOCH)
+        .unwrap_or_default()
+        .as_secs()
+}