fix: fix dynamodb drop table

[LuQQiu]

First PR of lancedb/lancedb#1812

Add the delete function to external manifest to delete manifest related metadata during drop_table

[github-actions]

ACTION NEEDED
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The PR title and description are used as the merge commit message. Please update your PR title and description to match the specification.

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[LuQQiu]

Second PR: lancedb/lancedb#1866
which wait for lance release

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 63.41463% with 15 lines in your changes missing coverage. Please review.

Project coverage is 77.89%. Comparing base (920b191) to head (fa0e45d).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...ust/lance-table/src/io/commit/external_manifest.rs	0.00%	8 Missing ⚠️
rust/lance-table/src/io/commit/dynamodb.rs	85.18%	2 Missing and 2 partials ⚠️
rust/lance-table/src/io/commit.rs	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3152      +/-   ##
==========================================
+ Coverage   77.87%   77.89%   +0.01%     
==========================================
  Files         242      242              
  Lines       82214    82368     +154     
  Branches    82214    82368     +154     
==========================================
+ Hits        64028    64157     +129     
- Misses      14987    15004      +17     
- Partials     3199     3207       +8     

Flag	Coverage Δ
unittests	77.89% <63.41%> (+0.01%)	⬆️

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