feat(logcache): limit max block count

[superhx]

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Pull Request Overview

This PR refactors the LogCache class to introduce block count tracking and improve the eviction mechanism for cache blocks. The changes split the previous combined free and merge logic into separate methods, add a maximum block count limit, and remove an unused forceFree method.

• Introduces block count tracking with MAX_BLOCKS_COUNT constant and blockCount field
• Refactors tryRealFree() to consider both capacity and block count limits
• Extracts merge logic into a separate tryMerge() method
• Removes the unused forceFree() method

Comments suppressed due to low confidence (1)

s3stream/src/main/java/com/automq/stream/s3/cache/LogCache.java:312

• When a block is removed during merge in tryMerge(), the blockCount should be decremented to maintain consistency with the blocks list. Add blockCount.decrementAndGet(); after iter.remove();.

                iter.remove();

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