Use esquema (github:fatfingers23/esquema@9ef00b9) to generate rust code
for the lexicons that we have.
Currently, esquema doesn't seem to support top level integer types. I've
opted to temporarily remove `indexProgress` from my.spoor.log.activity
while compiling, and then adding it back afterwards.
I could compile esquema with the following added to my flake.nix
```
nativeBuildInputs = with pkgs; [
pkg-config
openssl
openssl.dev
];
PKG_CONFIG_PATH = "${pkgs.openssl.dev}/lib/pkgconfig";
```
at a later date I will add it as a dependency, but I spent a while
trying to package esquema to no results.
Moves file contents out of ./rust since I'm planning to go with rust for
the backend and the lexicons will be used for codegen soon anyways.
I also added extra files that have been in the works that I have been
accidentally sprinkling into main.rs already. God forbid I need to
cherry-pick anything from so far back in the history.
It will make git blame ugly though.
