Use Handlebars Template for Benchmark CLI Output (#7390)

* add_handlebar_template_to_benchmark

- add benchmark-cli arg to take in a handlebar-template file

* update to always use template

* rewrite writer for handlebars

* polish

* pass cmd data

* update docs

* support custom filename output

* Update command.rs

* Create frame-weight-template.hbs

* use a vector to maintain benchmark order

* fix tests

* Custom string serializer, remove feature flag

* update docs

* docs on public objects

* small fix

Co-authored-by: Ezadkiel Marbella <[email protected]>