Update signature files to the new format
The new format is described in tools/metalava/FORMAT.md.
Fixes: 116589402 Switch signature files over to the v2 format
Fixes: 112626813 Drop "synchronized" modifier from the signature format
Fixes: 122358225 Omit overriding methods that only differ in final [...]
Fixes: 73088715 API Review: Need doclava to output nullability
Fixes: 79739773 API Review: Metalava enforcing constants are constant
Exempt-From-Owner-Approval: Large-scale tooling change
Test: make sdk, make update-api, make checkapi
Change-Id: I7245426a822c94a7a14219de521926b55a3a1ffc
Merged-In: I83a5babc7fb47bb83ba805b309bbf3e30548add4
12 files changed