fix: replace @JsonProperty with @JsonIgnore on request getter methods

[fern-api]

Version Bump: These are internal serialization annotation corrections and a concurrency safety fix with no changes to public method signatures or observable API behavior.

Request classes across multiple endpoints were incorrectly annotating
their getter methods with @JsonProperty, which caused Jackson to attempt
to serialize these request objects as JSON bodies. Since these fields are
sent as query parameters (not request body fields), they should be
excluded from JSON serialization. Replacing @JsonProperty with @JsonIgnore
on all getters corrects this behavior across GetAggregationCountRequest,
GetAuthorsRequest, and GetBreakingNewsRequest.

Additionally, RefactoryInterceptor now creates a fresh ExponentialBackoff
instance per retry chain invocation instead of sharing a single instance,
preventing potential state leakage between concurrent requests.

Key changes:

• Replace @JsonProperty with @JsonIgnore on all getter methods in GetAggregationCountRequest, GetAuthorsRequest, and GetBreakingNewsRequest
• Create a new ExponentialBackoff instance per retryChain() call in RetryInterceptor instead of reusing a shared instance

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