config.h: Align mldsa-native and mlkem-native config.h

[willieyz]

• Resolves: #688

• This PR aligns the config.h differences between mldsa-native and mlkem-native.

• For example, In mlkem-native, MLK_CONFIG_FILE is the second entry, while in mldsa-native, MLD_CONFIG_FILE was moved to the fifth position and mixed with native-backend configuration macros.

• Aligning these discrepancies simplifies future porting and modifications, and helps prevent issues like the missing macros fixed in #686.

• The following discrepancies also had been addressed:

  • MLD_CONFIG_MONOBUILD_KEEP_SHARED_HEADERS missing in mldsa-native, fixed.
  • MLK_CONFIG_NO_ASM_VALUE_BARRIER missing in mlkem-native, fixed in mlkem-naitve PR #1325
  • Missing FIPS 203 citation, fixed in mlkem-naitve PR #1325

[willieyz]

Hello, @mkannwischer , thank you for your review! I had addressed according to your comment, include:

• Add missing MLD_CONFIG_MONOBUILD_KEEP_SHARED_HEADERS
• Also, I had create another PR in mkem-native, added the missing MLK_CONFIG_NO_ASM_VALUE_BARRIER