Added flux demo

[cehongwang]

Description

Please include a summary of the change and which issue is fixed. Please also include relevant motivation and context. List any dependencies that are required for this change.

Fixes # (issue)

Type of change

Please delete options that are not relevant and/or add your own.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

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]

Can the app display the inference time, might be nice to have some stats rendered live as you generate

[peri044]

use them from examples

[peri044]

I think we should avoid copying the whole model scripts for measuring perf. Try using the sys.path approach and importing the model and just a perf loop. something like

import sys
import os
sys.path.append(torchtrt_root + "examples/dynamo/apps")
from flux_demo import *
model = <insert FLUX model (fp16 or fp8) > 
results = measure_flux_perf(.... )