feat: support dynamic options, static files and multiple templates

[mduthey]

This pr's adds new logic to bindgen supporting static files and dynamic options. Those options will get pass to handlebars as data which will be used internally.

Added new template property on bindings and deprecate plugin property.
This new template property allow to define the repository to take the template, the path from root to it and a ref which could be a branch or commit from where to take the template. If ref is missing, main will be the default one

Web-sdk template is updated on tx3-lang/web-sdk#18 and can be used as

[[bindings]]
template = { repo = "tx3-lang/web-sdk", path = "bindgen/client-lib", ref = "main" }
output_dir = "./gen/typescript/standalone"
options = { standalone = true }

[[bindings]]
template = { repo = "tx3-lang/web-sdk", path = "bindgen/client-lib" }
output_dir = "./gen/typescript/protocol-only"
options = { standalone = false }

and the output for this will be