Investigate swapping over to the new 'air' package

## Is your feature request related to a problem? Please describe.
Currently we use styler in our commit hooks (https://github.com/dfe-analytical-services/dfeshiny/blob/main/R/pre_commit.R) to format R code automatically, for larger projects this can be noticeably slow and create friction for analysts adopting code styling best practices.

[Air](https://www.tidyverse.org/blog/2025/02/air/#installing-air) has recently been released and claims to be as much as 100x faster than styler, seems like we should look at swapping over to this.

## Describe the solution you'd like
Ideally we:
- swap styler out for air in our commit hooks (https://github.com/dfe-analytical-services/dfeshiny/blob/main/R/pre_commit.R)
- keep it so that analysts can run a single command `dfeshiny::init_hooks()` to add or update their commit hooks on a project
- keep it so that analysts joining a project can run the commit hooks without additional setup beyond cloning a repo and running `renv::restore()`