13.2.0

feat: add configurable logging support to SDK clients

Introduce a structured logging system that allows SDK consumers to
capture HTTP request/response activity at configurable levels. Logging
is silent by default — no output is produced unless explicitly
configured via LogConfig.

Additionally, request objects that send query parameters (GetFilesMetadataRequest,
GetEarnedRewardsRequest, GetLocationsByUserRequest, GetOffersByUserRequest,
GetSubscriptionsRequest, ActivateOfferRequest, BoostOfferRequest) have
their getter annotations corrected from @JsonProperty to @JsonIgnore,
ensuring these fields are not accidentally serialized into a request body.
Jackson dependencies are bumped from 2.18.2 to 2.18.6.

Key changes:
- Add `LogConfig`, `LogLevel`, `ILogger`, `Logger`, and `ConsoleLogger` to `com.kard.api.core` for opt-in HTTP logging
- Expose `logging(LogConfig)` builder method on `KardApiClientBuilder` and `AsyncKardApiClientBuilder`
- Replace `@JsonProperty` with `@JsonIgnore` on query-parameter getters across multiple request types to prevent incorrect body serialization
- Refactor `RetryInterceptor` to create a fresh `ExponentialBackoff` instance per retry cycle (internal correctness fix)
- Upgrade Jackson dependencies from 2.18.2 to 2.18.6

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