TMAP7 V&V cases

https://inldigitallibrary.inl.gov/sites/sti/sti/4215153.pdf#page=12.16

- [x] val-1c Problem 1c: Diffusion in a Partially Preloaded Semi-Infinite Slab : #55
- [x] val-1b (very simple problem but why not) #53
- [x] val 1d (may be tricky to get the strong trap case but we should add it)
- [x] val 1d a (script available [here ](https://github.com/gabriele-ferrero/Titans_TT_codecomparison/blob/main/Festim%20models/WeakTrap.py)) #56
- [x] val 1d b (script available [here](https://github.com/gabriele-ferrero/Titans_TT_codecomparison/blob/main/Festim%20models/StrongTrap.py))
- [ ] val 1e (script available [here](https://github.com/RemDelaporteMathurin/FESTIM-review/blob/main/comparison/tmap8/ver_1e/tmap8_ver1e.py))
- [ ] val 1f (heat transfer)
- [ ] val 1f a
- [ ] val 1f b
- [ ] val 1f c
- [ ] val 1f d (testing the convective boundary condition)

Read the TMAP7 V&V reference at page 12.16, then compare completed cases such as #53, #55, and #56 with the linked WeakTrap.py and StrongTrap.py scripts. Use comparison/tmap8/ver_1e/tmap8_ver1e.py as a reference for val 1e, and add val 1e plus val 1f cases a–d, including the convective-boundary-condition case.

Written by the indexing model from the issue text.