feat(cli): Add code-mappings upload command scaffold with file parsing

Add a new `code-mappings` subcommand group with an `upload` subcommand
that reads and validates a JSON file of code mappings. This is the first
step toward CLI support for bulk code mapping uploads to Sentry.

Author: romtsn

src/commands/code_mappings/upload.rs

@@ -2,9 +2,9 @@ use std::fs;
 
 use anyhow::{bail, Context as _, Result};
 use clap::{Arg, ArgMatches, Command};
-use serde::Deserialize;
+use serde::{Deserialize, Serialize};
 
-#[derive(Debug, Deserialize)]
+#[derive(Debug, Deserialize, Serialize)]
 #[serde(rename_all = "camelCase")]
 struct CodeMapping {
     stack_root: String,
@@ -13,7 +13,7 @@ struct CodeMapping {
 
 pub fn make_command(command: Command) -> Command {
     command
-        .about("Upload code mappings for a project from a JSON file. Each mapping pairs a stack trace root (e.g. com/example/module) with the corresponding source path in your repository (e.g. modules/module/src/main/java/com/example/module).")
+        .about("Upload code mappings for a project from a JSON file.")
         .arg(
             Arg::new("path")
                 .value_name("PATH")
@@ -36,9 +36,8 @@ pub fn make_command(command: Command) -> Command {
 }
 
 pub fn execute(matches: &ArgMatches) -> Result<()> {
-    let path = matches
-        .get_one::<String>("path")
-        .expect("path is a required argument");
+    #[expect(clippy::unwrap_used, reason = "path is a required argument")]
+    let path = matches.get_one::<String>("path").unwrap();
     let data = fs::read(path).with_context(|| format!("Failed to read mappings file '{path}'"))?;
 
     let mappings: Vec<CodeMapping> =

tests/integration/_cases/code_mappings/code-mappings-help.trycmd

@@ -7,9 +7,7 @@ repository, enabling source context and code linking in Sentry.
 Usage: sentry-cli[EXE] code-mappings [OPTIONS] <COMMAND>
 
 Commands:
-  upload  Upload code mappings for a project from a JSON file. Each mapping pairs a stack trace root
-          (e.g. com/example/module) with the corresponding source path in your repository (e.g.
-          modules/module/src/main/java/com/example/module).
+  upload  Upload code mappings for a project from a JSON file.
   help    Print this message or the help of the given subcommand(s)
 
 Options:

tests/integration/_cases/code_mappings/code-mappings-no-subcommand.trycmd

@@ -7,9 +7,7 @@ repository, enabling source context and code linking in Sentry.
 Usage: sentry-cli[EXE] code-mappings [OPTIONS] <COMMAND>
 
 Commands:
-  upload  Upload code mappings for a project from a JSON file. Each mapping pairs a stack trace root
-          (e.g. com/example/module) with the corresponding source path in your repository (e.g.
-          modules/module/src/main/java/com/example/module).
+  upload  Upload code mappings for a project from a JSON file.
   help    Print this message or the help of the given subcommand(s)
 
 Options:

tests/integration/_cases/code_mappings/code-mappings-upload-help.trycmd

@@ -1,9 +1,7 @@
 ```
 $ sentry-cli code-mappings upload --help
 ? success
-Upload code mappings for a project from a JSON file. Each mapping pairs a stack trace root (e.g.
-com/example/module) with the corresponding source path in your repository (e.g.
-modules/module/src/main/java/com/example/module).
+Upload code mappings for a project from a JSON file.
 
 Usage: sentry-cli[EXE] code-mappings upload [OPTIONS] <PATH>