Create reldev profile:

It allows having way smaller binaries while still being able to have proper backtraces: `reldbg` is great for iOS because it allows inline debugging using LLDB in Xcode, but it produces enormous binaries, while for Android we can't use that properly and we'd only be interested in having symbolicated backtraces, which this profile achieves with binaries an order of magnitude smaller.

Cargo.toml

@@ -169,6 +169,19 @@ unused_async = "warn"
 # Saves a lot of disk space. If symbols are needed, use the dbg profile.
 debug = 0
 
+# Profile for debug builds with full optimization and minimal debug symbols.
+# This should be just enough to have proper backtraces, having way smaller binaries
+# (10% of the size with full debug symbols profile, like `reldbg`).
+# This profile differs from `reldbg` in not containing the debug symbols needed for
+# debugging with LLDB/GDB, trading that for binary size, allowing quick iterations
+# of building the bindings, installing in a real device, testing your changes, repeat.
+# It's also different from `dev` in having enough debug symbols to display backtraces.
+[profile.reldev]
+inherits = "dev"
+opt-level = 3
+debug = "line-tables-only"
+strip = "debuginfo"
+
 [profile.dev.package]
 # Optimize quote even in debug mode. Speeds up proc-macros enough to account
 # for the extra time of optimizing it for a clean build of matrix-sdk-ffi.
@@ -188,7 +201,6 @@ debug = 2
 [profile.reldbg]
 inherits = "dbg"
 opt-level = 3
-strip = "debuginfo"
 
 [profile.dist]
 # Use release profile as a base