feat(Space): register NormedSpace ℝ (Space d) as a direct instance

[zhikaip]

Typeclass search could not find the operator-norm structure on Space d →L[ℝ] ℝ (e.g. NormSMulClass ℝ (Space d →L[ℝ] ℝ)): since Space d has a standalone Module instance, NormedSpace ℝ (Space d) had to be synthesised as a postponed subgoal via InnerProductSpace.toNormedSpace, which needs one more level of postponed synthesis than the default maxSynthPendingDepth allows. Registering the instance directly (definitionally the same, cf. Mathlib's shortcut instances) fixes this and makes two set_option maxSynthPendingDepth 10000 workarounds unnecessary.

Changes

• Physlib/SpaceAndTime/Space/Module.lean: new instance NormedSpace ℝ (Space d) := InnerProductSpace.toNormedSpace.
• Physlib/SpaceAndTime/Space/ConstantSliceDist.lean: drop set_option maxSynthPendingDepth 10000 on schwartzMap_fderiv_integrable_slice_symm.
• Physlib/SpaceAndTime/TimeAndSpace/ConstantTimeDist.lean: drop set_option maxSynthPendingDepth 10000 on integrable_fderiv_space.

No lemmas or definitions added or removed.

Reviewer map: the instance and its docstring in Module.lean, then the two one-line deletions.

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[github-actions]

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[jstoobysmith]

Approved