[FEM] TetrahedralCorotationalFEMForceField fix stream functions

[Lucas-TJ]

Hello !

For my project, I want to save and load data from components. In TetrahedralCorotationalFEMForceField, I had a problem with the data " tetrahedronInfo" : this data contained no value, but this is necessary to load correctly.

So, in this PR, I fix the Output stream and Input stream functions from TetrahedralCorotationalFEMForceField.

For example,
Without this PR :

With this PR :

Now, I can save and load the component TetrahedralCorotationalFEMForceField.

Thank you !

[with-all-tests]

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• it builds with SUCCESS for all platforms on the CI.
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• it does not generate new unit test failures.
• it does not generate new scene test failures.
• it does not break API compatibility.
• it is more than 1 week old (or has fast-merge label).

[fredroy]

[ci-build][with-all-tests]

[alxbilger]

Could you add a test checking that you can read something that you saved, and that it matches?