Lexicon Module, codegen current lexicons

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.

src/lexicons/my/spoor.rs

@@ -0,0 +1,4 @@
+// @generated - This file is generated by esquema-codegen (forked from atrium-codegen). DO NOT EDIT.
+//!Definitions for the `my.spoor` namespace.
+pub mod content;
+pub mod log;