Make ConfigOptions easier to work with #3909
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Draft as it builds on #3885
Which issue does this PR close?
Resolves #3886
Related to #3887
Rationale for this change
see #3886
Note I chose to keep the
Arcoutside so it stayed clear thatConfigOptionswas shared in many placesWhat changes are included in this PR?
Changes:
ConfigOptionshave "interior mutability" (aka move the lock inside) rather than at CallSitesAre there any user-facing changes?
API for ConfigOptions has changed