[Enhancement] modified template to automatically generate resources.claim

[ryojsb]

This PR let us release from the complicated specification when useing existing ResourceClaimTemplate.

Currently we have to specify spec.resourceClaims and resources.claims only when using existing ResourceClaimTemplate while accelerator's DRA parameters are automatically generated and merged.

accelerator:
  type: nvidia
  dra: true

decode:
  create: true
    resources:
      limits:
      ...
      claims:
      - name: llm-d-imex-channel-0
    mountModelVolume: true
  resourceClaims:
  - name: llm-d-imex-channel-0

In this PR, you'll only specify spec.resourceClaims when using existing ResourceClaimTemplate.

Then accelerator's resources.claims and the ones of existing ResourceClaimTemplate are automatically generated.

accelerator:
  type: nvidia
  dra: true

decode:
  create: true
    resources:
      limits:
      ...
    mountModelVolume: true
  resourceClaims:
  - name: llm-d-imex-channel-0

[kalantar]

looks good. nice simplification