Add package source mappings

[martincostello]

Add package source mappings for central package management.

[codecov]

Codecov Report

Merging #520 (1bc2dd5) into main (8afb521) will decrease coverage by 35.11%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##             main     #520       +/-   ##
===========================================
- Coverage   94.07%   58.96%   -35.12%     
===========================================
  Files          22       22               
  Lines        1216     1216               
===========================================
- Hits         1144      717      -427     
- Misses         72      499      +427     

Flag	Coverage Δ
linux	58.79% <ø> (ø)
macos	58.96% <ø> (-0.17%)	⬇️
windows	?

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Impacted Files	Coverage Δ
src/SqlLocalDb/Interop/WindowsRegistry.cs	0.00% <0.00%> (-100.00%)	⬇️
src/SqlLocalDb/Interop/SafeLibraryHandle.cs	0.00% <0.00%> (-100.00%)	⬇️
src/SqlLocalDb/Interop/WindowsRegistryKey.cs	0.00% <0.00%> (-100.00%)	⬇️
src/SqlLocalDb/Interop/LocalDbInstanceInfo.cs	6.66% <0.00%> (-93.34%)	⬇️
src/SqlLocalDb/Interop/LocalDbInstanceApi.cs	8.69% <0.00%> (-82.61%)	⬇️
src/SqlLocalDb/Interop/LocalDbVersionInfo.cs	25.00% <0.00%> (-75.00%)	⬇️
src/SqlLocalDb/SqlLocalDbApi.cs	32.01% <0.00%> (-58.54%)	⬇️
...SqlLocalDb/ISqlLocalDbInstanceManagerExtensions.cs	50.00% <0.00%> (-50.00%)	⬇️
src/SqlLocalDb/ISqlLocalDbApiExtensions.cs	74.41% <0.00%> (-25.59%)	⬇️
src/SqlLocalDb/SqlLocalDbInstanceManager.cs	78.18% <0.00%> (-21.82%)	⬇️
... and 5 more

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