[feature request] Enable Inplace-resizing upon claiming sandboxes

[furykerry]

What would you like to be added:

1. enable E2B sandbox api to accept an extra metadata, e.g.
   e2b.agents.kruise.io/cpu-scale-factor: 2
2. sandbox manager try to scale the cpu of the allocated sandbox based on the cpu-scale-factor
3. [optional] return the sandbox immediately once we are sure that the resizing is feasible(PodResizingInProgress condition)

Why is this needed:
To reduce overall cost of maintaining a warm-up pool, the users desire to keep a pool of sandboxes with minimum resources, and once the sandboxes is claimed, the allocated sandbox can be resized inplace to a larger size. And the sandbox can even be return to the agent user even if the sandbox is still in the process of inplace resizing.

[sivanzcw]

I'm keep on solving this, thanks.

/assign