chore: upgrade databend-meta stack to land rotbl 0.2.10

[drmingdrmer]

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Summary

chore: upgrade databend-meta stack to land rotbl 0.2.10

Bump databend-meta to 260312.6.0, databend-meta-client to
260205.5.0, and databend-base to 0.3.0. The three move in
lockstep because both the server and client trees consume
rotbl 0.2.10, which eliminates Mutex<File> serialization in the
block reader (pread-based ReaderAt) and switches the block cache
from a hand-rolled LRU to moka::sync::Cache with singleflight
loading — ~78-95x throughput improvement under contention.

databend-base 0.3.0 is part of the same cascade: the new
databend-meta server pins databend-base ^0.3.0 because the
histogram module was extracted into the standalone base2histogram
crate. databend-meta-client 260205.5.0 is the corresponding release
of the r-260205 client line carrying the same databend-base floor,
so the two trees coexist under a single [patch.crates-io] entry.

Drop snapshot_db_block_cache_item from RaftConfig: rotbl 0.2.10's
moka::sync::Cache cannot enforce an item count and a byte weight
independently, so byte capacity is now the single sizing knob.
--snapshot-db-block-cache-size remains and still defaults to 1 GiB.

Tests

• Unit Test
• Logic Test
• Benchmark Test
• No Test - Explain why

Type of change

• Other

Related Issues

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This change is 

[xp-trumpet]

@xp-trumpet reviewed 3 files and all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on drmingdrmer).

[github-actions]

🤖 CI Job Analysis

Workflow: 24288108940

📊 Summary

• Total Jobs: 87
• Failed Jobs: 1
• Retryable: 0
• Code Issues: 1

❌ NO RETRY NEEDED

All failures appear to be code/test issues requiring manual fixes.

🔍 Job Details

• ❌ linux / sqllogic / standalone_iceberg_tpch: Not retryable (Code/Test)

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