Egobox

* `ego`:
* Implement upper trusted bound criterion for constraint handling by relf in <https://github.com/relf/egobox/pull/245>
* Implement constrained infill criterion by relf in <https://github.com/relf/egobox/pull/246>
* `moe`: Relax number of points required wrt regression spec by relf in <https://github.com/relf/egobox/pull/244>

* `ego`: Manage constraints as functions by relf in <https://github.com/relf/egobox/pull/242>

* `gp`: **Breaking change** - Change GP training Rust API to use one dimensional array by relf in <https://github.com/relf/egobox/pull/222>
* `doe`: Fix optimized LHS ESE algorithm by relf in <https://github.com/relf/egobox/pull/219>
* `egobox::Gpx`: Exception raised if training output data is not one-dimensional by relf in <https://github.com/relf/egobox/pull/218>
* `moe`: Refactor `predict_smooth` by relf in <https://github.com/relf/egobox/pull/221>
* Update to numpy crate 0.22.1 to fix win32 compilation by relf in <https://github.com/relf/egobox/pull/216>

* `moe`: Save/Load surrogates in binary format by relf in <https://github.com/relf/egobox/pull/213>
* Fix badge link by relf in <https://github.com/relf/egobox/pull/201>
* Upgrade to PyO3 0.22 by relf in <https://github.com/relf/egobox/pull/203>

* Add EGObox logo by relf in <https://github.com/relf/egobox/pull/193>
* `gp`: Add training infos getters at Python level by relf in <https://github.com/relf/egobox/pull/196>
* `ego`:
* Add checkpointing and hot start by relf in <https://github.com/relf/egobox/pull/197>
* Do not activate TREGO by default by relf in <https://github.com/relf/egobox/pull/198>
* Improve hot start API by relf in <https://github.com/relf/egobox/pull/199>

* `ego`:
* Save config and optim history by relf in <https://github.com/relf/egobox/pull/190>
* Move the DOE save after the algo the iteration (fixes 182) by relf in <https://github.com/relf/egobox/pull/185>
* Maintainance by relf in <https://github.com/relf/egobox/pull/183>