Add air dose response to dose_coefficients

[GuySten]

Description

This PR add an air dose response option to openmc.data.dose_coefficients

This will enable calculation of absorbed dose in air in subsequent PRs.

Checklist

• I have performed a self-review of my own code
• I have run clang-format (version 15) on any C++ source files (if applicable)
• I have followed the style guidelines for Python source files (if applicable)
• I have made corresponding changes to the documentation (if applicable)
• I have added tests that prove my fix is effective or that my feature works (if applicable)

[vitmog]

@GuySten, as @marco-de-pietri noted in #3700, the mass energy-absorption coefficient $\mu_{en} / \rho$ defines absorbed dose, but not kerma. Also, these coefficients in cm2/g must be multiplied by the particle energy $E$ in MeV with the conversion coefficient 1.602E-10 Gy/(MeV/g) (or 160.2 pGy/(MeV/g)) to obtain absorbed dose in Gy to use them as a response function similarly to the fluence-to-dose conversion factors in pSv-cm2.

I really not sure that this response function deserves to be in the library, because there is not any known to me general problem of calculation of the absorbed dose specifically in air. The used in real world quantities are ICRP effective doses and ambient equivalents H*(10), H*(3) and H*(0.07) (two the last -- rarely), also they could be required equivalent doses ANSI-77 and ANSI-91 for comparisons with legacy measurements in the US and organ equivalent doses from ICRP for medical physics purposes.

EDIT.
The units conversion is implemented right, so my comment above is excessive.

[GuySten]

I think I did convert the units correctly.

@vitmog, after thinking about it. Except maybe for comparison with FISPACT, I cannot think about a case where absorbed dose in air is relevant.
So unless @marco-de-pietri think otherwise I will close this PR.