Remove compatibility with non-hierarchical projects

[twyatt]

See michaelbull/kotlin-result#71 (comment) for more details on why we should only support hierarchical consumers.

[github-actions]

Test Results

  32 files    32 suites   7s ⏱️
233 tests 226 ✔️   7 💤 0 ❌
250 runs  238 ✔️ 12 💤 0 ❌

Results for commit cdac600.

[codecov]

Codecov Report

Merging #254 (cdac600) into main (1c1547e) will decrease coverage by 8.99%.
The diff coverage is 80.27%.

@@             Coverage Diff              @@
##               main     #254      +/-   ##
============================================
- Coverage     94.44%   85.46%   -8.99%     
- Complexity       51       91      +40     
============================================
  Files            13       20       +7     
  Lines           126      282     +156     
  Branches          8       15       +7     
============================================
+ Hits            119      241     +122     
- Misses            6       37      +31     
- Partials          1        4       +3     

Impacted Files	Coverage Δ
coroutines/src/commonMain/kotlin/flow/Combine.kt	0.00% <ø> (ø)
logging/src/commonMain/kotlin/Metadata.kt	76.92% <0.00%> (-0.86%)	⬇️
logging/src/commonMain/kotlin/Sensitivity.kt	0.00% <0.00%> (ø)
...tines/src/commonMain/kotlin/delay/DelayStrategy.kt	47.50% <47.50%> (ø)
logging/src/commonMain/kotlin/DispatchLogger.kt	92.10% <89.65%> (-7.90%)	⬇️
logging/src/commonMain/kotlin/Log.kt	98.27% <93.75%> (-1.73%)	⬇️
logging/src/commonMain/kotlin/FilterLogger.kt	95.65% <95.65%> (ø)
...t/src/commonMain/kotlin/TuulboxKtorClientLogger.kt	100.00% <100.00%> (ø)
logging/src/commonMain/kotlin/FilterLevelLogger.kt	100.00% <100.00%> (ø)
logging/src/commonMain/kotlin/LogLevel.kt	100.00% <100.00%> (ø)
... and 1 more

... and 2 files with indirect coverage changes

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