feat(core): Make installment_payment_enabled,recurring_enabled Optional (#8201)

Co-authored-by: hyperswitch-bot[bot] <148525504+hyperswitch-bot[bot]@users.noreply.github.com>
Files to modify:


**admin.rs**
  Modify existing code

**payment_methods.rs**
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**payment_methods.rs**
  Modify existing code

**transformer.rs**
  Modify existing code

**evaluation.rs**
  Modify existing code

**mca.rs**
  Modify existing code

**helpers.rs**
  Modify existing code

**utils.rs**
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**cards.rs**
  Modify existing code

**card_executor.rs**
  Modify existing code

**payment_method_executor.rs**
  Modify existing code

**transformers.rs**
  Modify existing code

**tokenization.rs**
  Modify existing code

**admin.rs**
  Modify existing code

**transformers.rs**
  Modify existing code