feat(measure_theory/bochner_integration): linearity of the Bochner Integral (#1745)
* Linearity of the Bochner Integral
* prove integral_neg and integral_smul with less assumptions; make integral irreducible
* remove simp tag
* create simp set for integral
* Add simp_attr.integral to nolint
* Make it possible to unfold the definition of `integral`
and other things.
* Update nolints.txt
* Make it possible to unfold l1.integral
* Update bochner_integration.lean
* Update bochner_integration.lean