fix: implementation of Default for config::CacheConfig should use values from inner::CacheConfig

[dantengsky]

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Summary

implementation of Default for config::CacheConfig should use values from inner::CacheConfig

after fix:

CACHE_ENABLE_TABLE_META_CACHE=true ./target/debug/databend-query --meta-embedded-dir .databend/meta

default values of cache configs are as expected

mysql> select * from system.configs where "group" = 'cache';
+-------+----------------------------------------+--------------------+-------------+
| group | name                                   | value              | description |
+-------+----------------------------------------+--------------------+-------------+
| cache | enable_table_meta_cache                | true               |             |
| cache | table_meta_snapshot_count              | 256                |             |
| cache | table_meta_segment_count               | 10240              |             |
| cache | table_meta_statistic_count             | 256                |             |
| cache | enable_table_bloom_index_cache         | true               |             |
| cache | table_bloom_index_meta_count           | 3000               |             |
| cache | table_bloom_index_filter_count         | 1048576            |             |
| cache | data_cache_storage                     | none               |             |
| cache | table_data_cache_population_queue_size | 65536              |             |
| cache | disk.max_bytes                         | 21474836480        |             |
| cache | disk.path                              | ./.databend/_cache |             |
| cache | table_data_deserialized_data_bytes     | 0                  |             |
+-------+----------------------------------------+--------------------+-------------+

Closes #10088

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Name	Status	Preview	Comments	Updated
databend	⬜️ Ignored (Inspect)			Feb 16, 2023 at 2:38PM (UTC)