feat(tools): add cli to measure decorator size in masp package

[mooori]

Context: #1013

Currently cargo miden build will always include the debug info most relevant for this kind of analysis. So as first step this PR adds tooling to strip decorators from a MastForest and report the resulting size change.

Here's an example of how to use the tool and the output it produces:

# Assumes `examples/basic-wallet` was built in release mode
# Can be pointed at any `.masp` file
> cargo run -p objsize -- decorators examples/basic-wallet/target/miden/release/basic_wallet.masp

Input: examples/basic-wallet/target/miden/release/basic_wallet.masp
Package kind: library
Artifact: library

Metric                 KB   Delta  Delta %
original masp       36.65       -        -
original forest     36.13    0.00   +0.00%
without decorators  17.95  -18.19  -50.33%
compacted forest    13.10  -23.03  -63.74%

Users who wish to run it on their own masp packages may want to build the binary and add it to their path.