Feat/add broker id bitmar bitmex

[cardosofede]

Before submitting this PR, please make sure:

• [ ] Your code builds clean without any errors or warnings
• [ ] You are using approved title ("feat/", "fix/", "docs/", "refactor/")

A description of the changes proposed in the pull request: Add the broker ids for Bitmart and Bitmex based on the conversations with the exchanges.

Tests performed by the developer:

Tips for QA testing: