can resources.cores support floating-point numbers? such as 0.2?

### Proposal
Hello, may I ask if resources.cores can support floating-point numbers? For example, 0.2

### Use-cases
My server has 64 cores. My service needs to ensure high real-time performance, so cores need to be bound for operation. I need to run 320 containers on one server, that is, each CPU core can be bound to 5 containers. Therefore, the cores parameter needs to be configured to 0.2

### Attempted Solutions
resources.cores can support floating-point numbers? For example, 0.2

Start by tracing how resources.cores is parsed, validated, and used for CPU binding and allocation. Determine the behavior needed for a value such as 0.2, then add coverage for fractional cores and verify that scheduling and binding produce the expected result for the stated container workload.

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