Move internal to crates as they would be published, add changelog

[tlepoint]

No description provided.

[codecov]

Codecov Report

Merging #120 (2d4ac3c) into main (ecba998) will decrease coverage by 0.78%.
The diff coverage is 61.53%.

@@            Coverage Diff             @@
##             main     #120      +/-   ##
==========================================
- Coverage   89.22%   88.44%   -0.79%     
==========================================
  Files          36       37       +1     
  Lines        8241     8385     +144     
==========================================
+ Hits         7353     7416      +63     
- Misses        888      969      +81     

Impacted Files	Coverage Δ
crates/fhe-math/src/errors.rs	87.50% <ø> (ø)
crates/fhe-math/src/proto/rq.rs	44.44% <ø> (ø)
crates/fhe-math/src/rns/mod.rs	96.15% <ø> (ø)
crates/fhe-math/src/rns/scaler.rs	98.25% <ø> (ø)
crates/fhe-math/src/rq/context.rs	85.82% <ø> (ø)
crates/fhe-math/src/rq/convert.rs	90.27% <ø> (ø)
crates/fhe-math/src/rq/mod.rs	99.20% <ø> (ø)
crates/fhe-math/src/rq/ops.rs	94.63% <ø> (ø)
crates/fhe-math/src/rq/scaler.rs	93.96% <ø> (ø)
crates/fhe-math/src/rq/serialize.rs	96.42% <ø> (ø)
... and 25 more

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