feat(deps): upgrade all dependencies and migrate as required

[LeoniePhiline]

I have signed the individual CLA.

I am working on an implementation of #49.

In preparation, dependencies need to be brought up to date.

chore(deps): update transitive dependencies

This changeset updates transitive dependencies, while keeping Cargo.toml untouched.

fix(deps): upgrade assert_cmd to 2

Migrate assert_cmd from version 1 to 2. No relevant breaking changes.

fix(deps): upgrade crossterm to 0.27

Migrate crossterm from version 0.24 to 0.27. No relevant breaking changes.

fix(deps): upgrade rprompt to 2.1.1

Migrate rprompt from version 1 to 2.

Code migration was applied, adapting fastmod to rprompt breaking API changes:

https://github.com/conradkleinespel/rprompt/releases/tag/v2.0.2

feat(deps): upgrade clap from 2 to 4, migrating to clap derive

This changeset migrates fastmod from clap 2.x to the latest clap 4.x, migrating code around breaking changes.

The arguments setup and retrieval is migrated to clap's much more maintainable derive syntax.

All arguments are migrated to function identically to their clap 2 counterparts.

fix(deps): update grep from 0.2 to 0.3

Migrate grep from version 0.2 to 0.3. No relevant breaking changes. (grep-searcher was upgraded from 0.1.7 to 0.2.1, but re-export grep::searcher is unused in fastmod.)

style: fix all clippy lints

Fixes all clippy lints, while not changing application behavior.

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I will provide further patches updating direct crate dependencies.

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[LeoniePhiline]

@swolchok

This PR is meant as base for implementing opt-in fancy-regex support to allow for regex lookarounds.
However, the dependency upgrades are worth their own merge, and the fancy-regex feature might take some time.

If you can find time at all, I would very much appreciate if you could review this PR, and optionally cut a release (0.5.0).

All changes are logically grouped into individual commits and should be rather simple to review.
I definitely recommend reviewing commit by commit, rather than the combined PR diff.

Thank you very much!

[swolchok]

Sorry for the long delay; just now getting to my task backlog thanks to the impending holiday. In the future, using the GitHub request review feature on the PR. will give things a better chance of getting noticed.

[swolchok]

In my opinion, inlining this function does not make the code better. Why do we need to do it?

[swolchok]

why is there a # in the middle of this identifier?