Create simple inventory list (#120)

# Description

Please include a summary of the change and which issue is fixed. Please also include relevant motivation and context. List any dependencies that are required for this change.

- Create a simple inventory list

#97

## Type of change

Please delete options that are not relevant.

- [x] New feature (non-breaking change which adds functionality)

# How Has This Been Tested?

Please describe the tests that you ran to verify the changes. Provide instructions so we can reproduce. Please also list any relevant details to your test configuration.

# Checklist

- [ ] My code follows the style guidelines of this project
- [ ] I have performed a self-review of my own code
- [ ] I have commented my code, particularly in hard-to-understand areas
- [ ] I have made corresponding changes to the documentation
- [ ] My changes generate no new warnings
- [ ] I have added tests that provde my fix is effective or that my feature works
- [ ] New and existing unit tests pass locally with my changes
- [ ] Any dependent changes have been merged and published in downstream modules

Reviewed-on: https://gitea.vylpes.xyz/External/card-drop/pulls/120
Reviewed-by: VylpesTester <tester@vylpes.com>
Co-authored-by: Ethan Lane <ethan@vylpes.com>
Co-committed-by: Ethan Lane <ethan@vylpes.com>

src/commands/drop.ts

@@ -1,4 +1,4 @@
-import { AttachmentBuilder, CommandInteraction, DiscordAPIError, SlashCommandBuilder } from "discord.js";
+import { AttachmentBuilder, CommandInteraction, SlashCommandBuilder } from "discord.js";
 import { Command } from "../type/command";
 import { readFileSync } from "fs";
 import { CoreClient } from "../client/client";

src/commands/inventory.ts

@@ -0,0 +1,38 @@
+import { CommandInteraction, SlashCommandBuilder } from "discord.js";
+import { Command } from "../type/command";
+import InventoryHelper from "../helpers/InventoryHelper";
+
+export default class Inventory extends Command {
+    constructor() {
+        super();
+
+        this.CommandBuilder = new SlashCommandBuilder()
+            .setName('inventory')
+            .setDescription('View your inventory')
+            .addNumberOption(x =>
+                x
+                    .setName('page')
+                    .setDescription('The page to start with'));
+    }
+
+    public override async execute(interaction: CommandInteraction) {
+        const page = interaction.options.get('page');
+
+        try {
+            let pageNumber = 0;
+
+            if (page && page.value) {
+                pageNumber = Number(page.value) - 1;
+            }
+
+            const embed = await InventoryHelper.GenerateInventoryPage(interaction.user.username, interaction.user.id, pageNumber);
+
+            await interaction.reply({
+                embeds: [ embed.embed ],
+                components: [ embed.row ],
+            });
+        } catch {
+            await interaction.reply("No page for user found.");
+        }
+    }
+}