Implement SDK event replay and catch-up

[Levi-Ojukwu]

Description:

The SDK needs ability to replay historical events and catch up from a specific ledger.

Why it matters: Event replay is essential for building reliable applications.

Acceptance Criteria:

• Add replay(fromLedger) method to event subscription
• Handle ledger gaps gracefully
• Add tests

Relevant Files: sdk/src/events/subscribe.ts

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[Elizzy01]

@Elizzy01 has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

Hi, I'd like to work on this.

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[Stephan-Thomas]

@Stephan-Thomas has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

hi, i would like to work on this.

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[yours-anjikon]

@yours-anjikon has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

Would love to work on it

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