Add record migration

atuin-server-postgres/build.rs

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+// generated by `sqlx migrate build-script`
+fn main() {
+    // trigger recompilation when a new migration is added
+    println!("cargo:rerun-if-changed=migrations");
+}

atuin-server-postgres/migrations/20230623070418_records.sql

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+-- Add migration script here
+create table records (
+	id uuid primary key,            -- remember to use uuidv7 for happy indices <3
+	host uuid not null,             -- a unique identifier for the host
+	parent uuid not null,           -- the ID of the parent record, bearing in mind this is a linked list
+	timestamp bigint not null,      -- not a timestamp type, as those do not have nanosecond precision
+	version text not null,
+	tag text not null,              -- what is this? history, kv, whatever. Remember clients get a log per tag per host
+	data bytea not null,            -- store the actual history data, encrypted. I don't wanna know!
+
+	user_id bigint not null,        -- allow multiple users
+	created_at timestamp not null default current_timestamp
+);