add event feature to caldav mcp server

mcp_server_collection/Cargo.lock

@@ -739,6 +739,8 @@ dependencies = [
  "iso8601",
  "nom",
  "nom-language",
+ "rrule",
+ "thiserror",
  "uuid",
 ]
 
@@ -1328,6 +1330,18 @@ dependencies = [
  "syn",
 ]
 
+[[package]]
+name = "regex"
+version = "1.12.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e10754a14b9137dd7b1e3e5b0493cc9171fdd105e0ab477f51b72e7f3ac0e276"
+dependencies = [
+ "aho-corasick",
+ "memchr",
+ "regex-automata",
+ "regex-syntax",
+]
+
 [[package]]
 name = "regex-automata"
 version = "0.4.14"
@@ -1412,6 +1426,19 @@ dependencies = [
  "memchr",
 ]
 
+[[package]]
+name = "rrule"
+version = "0.14.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "720acfb4980b9d8a6a430f6d7a11933e701ebbeba5eee39cc9d8c5f932aaff74"
+dependencies = [
+ "chrono",
+ "chrono-tz",
+ "log",
+ "regex",
+ "thiserror",
+]
+
 [[package]]
 name = "rustls"
 version = "0.23.40"