Harden beats packet parsing

[kroepke]

Description

When parsing beats packets we allocated memory based on the declared frame sizes for the three possible frame types.
As the value is untrusted, we now reject unreasonable large values before allocating memory.

Motivation and Context

Malformed packets could lead to unreasonable memory allocation during beats protocol parsing.

How Has This Been Tested?

Unit tests

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Refactoring (non-breaking change)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have requested a documentation update.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.