Add arch type to the output of the plugin info cmd

[marckhouzam]

What this PR does / why we need it

On Darwin ARM64 machines, the CLI can install plugins using either an ARM64 or an AMD64 build, depending of plugin binary availability. Showing the arch type in the output of tanzu <plugin> info will help in troubleshooting.

Which issue(s) this PR fixes

Fixes # N/A

Describe testing done for PR

Build the builder plugin for both ARM64 and AMD64 using the plugin-runtime with this PR:

$ cd tanzu-cli
$ rm -rf artifacts
$ make plugin-build

# Install the newly built builder plugin for ARM64
$ tz plugin install --local-source artifacts/plugins/darwin/arm64 builder
[i] Installing plugin 'builder:v1.1.0-dev' with target 'global'
[ok] successfully installed 'builder' plugin

# Notice the "binaryArch" info
$ tz builder info
{"name":"builder","description":"Build Tanzu components","target":"global","version":"v1.1.0-dev","buildSHA":"1283b075b-dirty","digest":"","group":"Admin","docURL":"","completionType":0,"pluginRuntimeVersion":"v1.1.0-dev.0.20231010050932-6807eb0c63cf","binaryArch":"arm64"}

# Install the newly built builder plugin for AMD64
# We need an AMD64 CLI to do that, so I installed one
$ file ~/bin/tanzu.v1.0.0
/Users/kmarc/bin/tanzu.v1.0.0: Mach-O 64-bit executable x86_64
$ ~/bin/tanzu.v1.0.0 plugin install --local-source artifacts/plugins/darwin/amd64 builder
[i] Installing plugin 'builder:v1.1.0-dev' with target 'global'
[ok] successfully installed 'builder' plugin

# Notice the "binaryArch" info
$ tz builder info
{"name":"builder","description":"Build Tanzu components","target":"global","version":"v1.1.0-dev","buildSHA":"1283b075b-dirty","digest":"","group":"Admin","docURL":"","completionType":0,"pluginRuntimeVersion":"v1.1.0-dev.0.20231010050932-6807eb0c63cf","binaryArch":"amd64"}

Release note

Display the machine architecture of the plugin binary in the output of `tanzu <plugin> info`

Additional information

Special notes for your reviewer

[anujc25]

LGTM. Thanks