feat: add config file to webnsupdate

Move flags to config file, and add more options. Mirror some in the
module.

Cargo.lock

@@ -304,7 +304,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8835f84f38484cc86f110a805655697908257fb9a7af005234060891557198e9"
 dependencies = [
  "nonempty",
- "thiserror",
+ "thiserror 1.0.69",
 ]
 
 [[package]]
@@ -409,6 +409,12 @@ version = "1.0.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "df3b46402a9d5adb4c86a0cf463f42e19994e3ee891101b1841f30a545cb49a9"
 
+[[package]]
+name = "humantime"
+version = "2.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9b112acc8b3adf4b107a8ec20977da0273a8c386765a3ec0229bd500a1443f9f"
+
 [[package]]
 name = "hyper"
 version = "1.6.0"
@@ -454,6 +460,7 @@ dependencies = [
  "linked-hash-map",
  "once_cell",
  "pin-project",
+ "serde",
  "similar",
 ]
 
@@ -542,7 +549,7 @@ dependencies = [
  "supports-unicode",
  "terminal_size",
  "textwrap",
- "thiserror",
+ "thiserror 1.0.69",
  "unicode-width 0.1.14",
 ]
 
@@ -941,7 +948,16 @@ version = "1.0.69"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b6aaf5339b578ea85b50e080feb250a3e8ae8cfcdff9a461c9ec2904bc923f52"
 dependencies = [
- "thiserror-impl",
+ "thiserror-impl 1.0.69",
+]
+
+[[package]]
+name = "thiserror"
+version = "2.0.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "567b8a2dae586314f7be2a752ec7474332959c6460e02bde30d702a66d488708"
+dependencies = [
+ "thiserror-impl 2.0.12",
 ]
 
 [[package]]
@@ -955,6 +971,17 @@ dependencies = [
  "syn",
 ]
 
+[[package]]
+name = "thiserror-impl"
+version = "2.0.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7f7cf42b4507d8ea322120659672cf1b9dbb93f8f2d4ecfd6e51350ff5b17a1d"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "thread_local"
 version = "1.1.8"
@@ -1156,11 +1183,13 @@ dependencies = [
  "clap",
  "clap-verbosity-flag",
  "http",
+ "humantime",
  "insta",
  "miette",
  "ring",
  "serde",
  "serde_json",
+ "thiserror 2.0.12",
  "tokio",
  "tower-http",
  "tracing",