ISSUE-3898: Add partitions_total to Dal Context

[dantengsky]

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Summary

address issue #3898

Changelog

• Improvement
• Not for changelog (changelog entry is not required)

Related Issues

Fixes #3898

Test Plan

Unit Tests

Stateless Tests

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[codecov-commenter]

Codecov Report

Merging #3903 (15e9fe0) into main (3a3abf7) will increase coverage by 0%.
The diff coverage is 92%.

@@          Coverage Diff          @@
##            main   #3903   +/-   ##
=====================================
  Coverage     57%     57%           
=====================================
  Files        773     773           
  Lines      41298   41276   -22     
=====================================
- Hits       23865   23863    -2     
+ Misses     17433   17413   -20     

Impacted Files	Coverage Δ
query/src/interpreters/interpreter_query_log.rs	79% <75%> (-1%)	⬇️
common/dal/src/context.rs	81% <100%> (-1%)	⬇️
...ry/src/storages/fuse/operations/read_partitions.rs	97% <100%> (+<1%)	⬆️
query/src/storages/system/query_log_table.rs	85% <100%> (+<1%)	⬆️
common/grpc/src/dns_resolver.rs	21% <0%> (-22%)	⬇️
query/src/common/mod.rs	84% <0%> (-2%)	⬇️
common/ast/src/parser/expr/expr_visitor.rs	58% <0%> (-1%)	⬇️
common/meta/grpc/src/grpc_client.rs	0% <0%> (ø)
metasrv/src/meta_service/raftmeta.rs	48% <0%> (+<1%)	⬆️
... and 4 more

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