feat: add more useful version of get_mapped_ranges

[PierreZ]

No description provided.

[coveralls]

Pull Request Test Coverage Report for Build 3007332019

• 13 of 17 (76.47%) changed or added relevant lines in 1 file are covered.
• 16 unchanged lines in 3 files lost coverage.
• Overall coverage increased (+0.02%) to 74.623%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
foundationdb/src/transaction.rs	13	17	76.47%

Files with Coverage Reduction	New Missed Lines	%
foundationdb/src/directory/mod.rs	1	94.85%
foundationdb/src/directory/directory_partition.rs	6	84.33%
foundationdb/src/directory/directory_layer.rs	9	91.68%

Totals
Change from base Build 2977354854:	0.02%
Covered Lines:	4258
Relevant Lines:	5706

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💛 - Coveralls

[codecov-commenter]

Codecov Report

Merging #68 (7fc2442) into main (ef379b3) will decrease coverage by 0.00%.
The diff coverage is 76.47%.

@@            Coverage Diff             @@
##             main      #68      +/-   ##
==========================================
- Coverage   82.82%   82.82%   -0.01%     
==========================================
  Files          26       26              
  Lines        4937     4954      +17     
==========================================
+ Hits         4089     4103      +14     
- Misses        848      851       +3     

Impacted Files	Coverage Δ
foundationdb/src/transaction.rs	89.35% <76.47%> (-0.65%)	⬇️
foundationdb/src/directory/directory_layer.rs	91.68% <0.00%> (-1.42%)	⬇️
foundationdb/src/directory/mod.rs	94.85% <0.00%> (ø)
foundationdb/src/tuple/pack.rs	92.73% <0.00%> (+0.18%)	⬆️
foundationdb/src/mapped_key_values.rs	44.03% <0.00%> (+2.75%)	⬆️
foundationdb/src/directory/directory_partition.rs	84.32% <0.00%> (+2.98%)	⬆️

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