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#### Overview:

This PR adds a command-line verbosity flag (-v, -vv) to dynamo-run to control log levels.
- Added new verbosity flag to Flags struct:
  - -v: Sets log level to debug
  - -vv: Sets log level to trace
  - No flag (default): Keeps log level at info

#### Details:
- closes GitHub issue: https://github.com/ai-dynamo/dynamo/issues/567

Signed-off-by: Anant Sharma <anants@nvidia.com>

Signed-off-by: cormick <cormick1080@gmail.com>

Signed-off-by: Harry Kim <harry_kim@live.com>

"echo_core" is an engine that echoes the post-processed request back to you so you can see the template. Good for testing. It needed an extra flag set to work correctly.

Signed-off-by: Pavithra Vijayakrishnan <160681768+pvijayakrish@users.noreply.github.com>

Co-authored-by: ishandhanani <82981111+ishandhanani@users.noreply.github.com>

It's different enough that I made a new engine vllm0_8 and renamed the previous engine to vllm0_7.

`dynamo-run out=vllm` now expects 0.8. This matches the container change in #690.

For older use `dynamo-run out=vllm0_7`.

Co-authored-by: ishandhanani <82981111+ishandhanani@users.noreply.github.com>

Signed-off-by: Hongkuan Zhou <tedzhouhk@gmail.com>
Co-authored-by: Ryan McCormick <rmccormick@nvidia.com>

Co-authored-by: Ziqi Fan <ziqif@nvidia.com>