[LL FIR] Add Caffeine library dependency

- Our current FIR caches are based on `ConcurrentMap` and thereby do not
  support size and lifetime limits out of the box. For example,
  first-layer caches with a limited size can speed up access of the most
  frequently used elements, while having a small memory footprint.
- Caffeine is a modern and well optimized caching library that allows us
  to create thread-safe and performant caches with various size or
  lifetime limits.
- The cache must support concurrency because session components such as
  symbol providers may be accessed concurrently once parallel resolve in
  the Analysis API has been implemented (see KT-55750). Caffeine caches
  support concurrency.

gradle/verification-metadata.xml

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