feat: Add MessageMf

MessageMf has "Many fields" making it able to see how borrowed and
owned scale differently.

Added benchmarking creating default instances of Message and
MessageMf.

Removed the xxx_loop() variants as they don't add information just more
noise. I would like to look at why xxx_idx_loop() is sometimes slower
than xxx_iter_loop().

NOTE: I believe some of the noise is caused by code alignment changes
as we tweak that where doing and change code.
See: https://www.google.com/search?q=benchmark+sensitive+to+code+alignment
and rust-lang/rust#82232

Author: winksaville

Cargo.lock

@@ -2,7 +2,7 @@
 name = "exper-borrowed-vs-owned-parameters"
 authors = [ "Wink Saville <[email protected]" ]
 license = "MIT OR Apache-2.0"
-version = "0.2.0"
+version = "0.3.0"
 edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html