Rename type Field to lower-case field

[Savio-Sou]

Problem

All our types are in lower case except Field.

Not the end of the world, but simply less intuitive than it should be.

Happy Case

Field -> field

Alternatives Considered

No response

Additional Context

Breaking change

This would be a breaking change, where every Noir dev would have to rename all Fields in their programs.

Rust's practice

• Lowercase for builtin types
• Starts capitalized for custom types

Would you like to submit a PR for this Issue?

No

Support Needs

No response