feat: Introduce platform tier

[PierreZ]

Resolves #15

[PierreZ]

FoundationDB's website seems to be still down

[coveralls]

Pull Request Test Coverage Report for Build 1691736145

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 16 unchanged lines in 3 files lost coverage.
• Overall coverage decreased (-0.3%) to 69.918%

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Files with Coverage Reduction	New Missed Lines	%
foundationdb-bindingtester/src/main.rs	1	92.15%
target/x86_64-unknown-linux-gnu/debug/build/foundationdb-16280d48c628f45b/out/options.rs	4	32.48%
foundationdb/src/database.rs	11	73.91%

Totals
Change from base Build 1691711288:	-0.3%
Covered Lines:	2652
Relevant Lines:	3793

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💛 - Coveralls

[codecov-commenter]

Codecov Report

Merging #15 (0a06f2f) into main (e8a5ba5) will decrease coverage by 0.25%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main      #15      +/-   ##
==========================================
- Coverage   81.35%   81.09%   -0.26%     
==========================================
  Files          18       18              
  Lines        3089     3089              
==========================================
- Hits         2513     2505       -8     
- Misses        576      584       +8     

Impacted Files	Coverage Δ
foundationdb/src/database.rs	73.91% <0.00%> (-11.96%)	⬇️
foundationdb-bindingtester/src/main.rs	92.15% <0.00%> (+0.31%)	⬆️

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