Move enum definitions back into Order class

[sweep-nightly[bot]]

Purpose

This pull request aims to resolve the compilation errors reported in the GitHub Action by moving the enum definitions back into the Order class and removing the separate enum files.

Description

The changes made in this pull request are:

1. Moved all the enum definitions (TimeInForce, ExecuteSide, RejectReason, Type, CancelReason, Side) back into the Order class.
2. Removed the separate enum files (TimeInForce.java, ExecuteSide.java, RejectReason.java, Type.java, CancelReason.java, Side.java) as they are no longer needed.

Summary

• Moved enum definitions back into Order class
• Removed separate enum files
• Restored the original structure of the code

Fixes:

Failing CI in d6fc215

In pull request https://github.com/wwzeng1/CoralME/pull/11. Continue the conversation here: http://localhost:3000/c/69db2e07-6f3a-4bda-bbca-b3274455b344.

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^{Tracking ID: 0fe2881150}