Add overridable timeout values to FormattersBase

[clrudolphi]

🤔 What's changed?

Added two virtual properties to the FormattersBase class that provide the timeout values to use during Formatter disposal. These were previously hard-coded.

⚡️ What's your motivation?

This allows derivative formatters to set their own time-out values. The first real use of this is in the runtime tests in which the timeout values are set very small to allow those tests to complete much more quickly.

🏷️ What kind of change is this?

• 🏦 Refactoring/debt/DX (improvement to code design, tooling, etc. without changing behaviour)

♻️ Anything particular you want feedback on?

📋 Checklist:

• I've changed the behaviour of the code
  • I have added/updated tests to cover my changes.
• My change requires a change to the documentation.
  • I have updated the documentation accordingly.
• Users should know about my change
  • I have added an entry to the "[vNext]" section of the CHANGELOG, linking to this pull request & included my GitHub handle to the release contributors list.

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