Feature: #108229 - Fluid cache warmup 

See forge#108229

Description 

TYPO3 v14 leverages the revamped Fluid v5 warmup feature and integrates a fluid template warmup directly into CLI command typo3 cache:warmup.

The command finds and compiles all *.fluid.* (example: Index.fluid.html) files found in extensions.

Fluid warmup can also be called directly using typo3 fluid:cache:warmup which will additionally output compile time deprecations found within fluid template files.

Impact 

The warmup command can be useful to reduce ramp up time after deployments.