feat: Use a global timing cache and add a save option

[peri044]

Description

1. Adds an option to specify timing cache path. This is now a global cache used across multiple TRT engines.
2. Serializes the cache to ensure this can be reused in the next runs.

Type of change

• New feature (non-breaking change which adds functionality)

Checklist:

• My code follows the style guidelines of this project (You can use the linters)
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas and hacks
• I have made corresponding changes to the documentation
• I have added tests to verify my fix or my feature
• New and existing unit tests pass locally with my changes
• I have added the relevant labels to my PR in so that relevant reviewers are notified

[narendasan]

LGTM