dal2: Implement Context support

[Xuanwo]

I hereby agree to the terms of the CLA available at: https://databend.rs/dev/policies/cla/

Summary

Part of #3677

This PR implements a DAL Context which will implement Layer and Accessor.

Changelog

• New Feature

Test Plan

Unit Tests

Stateless Tests

[databend-bot]

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[codecov-commenter]

Codecov Report

Merging #4069 (df98dc2) into main (396fcae) will decrease coverage by 0%.
The diff coverage is n/a.

@@          Coverage Diff          @@
##            main   #4069   +/-   ##
=====================================
- Coverage     57%     57%   -1%     
=====================================
  Files        829     829           
  Lines      44231   44231           
=====================================
- Hits       25537   25533    -4     
- Misses     18694   18698    +4     

Impacted Files	Coverage Δ
common/dal2/src/accessor.rs	0% <ø> (ø)
common/dal2/src/ops/stat.rs	77% <ø> (ø)
common/dal2/src/services/fs.rs	82% <ø> (ø)
common/dal2/src/services/s3.rs	22% <ø> (ø)
common/management/src/cluster/cluster_mgr.rs	77% <0%> (-3%)	⬇️
metasrv/src/network.rs	97% <0%> (-2%)	⬇️
metasrv/src/meta_service/meta_service_impl.rs	92% <0%> (-2%)	⬇️
metasrv/src/meta_service/raftmeta.rs	48% <0%> (-1%)	⬇️
common/dal/src/context.rs	88% <0%> (+2%)	⬆️

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[Veeupup]

/LGTM

[BohuTANG]

/lgtm