Add release notes

RELEASE_NOTES.md

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+## What's Changed
+* Add release notes by @byte-bandit in https://github.com/palomachain/paloma/pull/1017
+* Revert "Add release notes" by @byte-bandit in https://github.com/palomachain/paloma/pull/1018
+* chore(deps): bump google.golang.org/grpc from 1.58.2 to 1.58.3 by @dependabot in https://github.com/palomachain/paloma/pull/1020
+* fix: assigning msgs to validators w/o chain support by @byte-bandit in https://github.com/palomachain/paloma/pull/1023
+* fix: gravity message logging format by @byte-bandit in https://github.com/palomachain/paloma/pull/1027
+* feat: introduce basic multisig message support by @byte-bandit in https://github.com/palomachain/paloma/pull/1025
+* feat: add query for last observed event nonce by @byte-bandit in https://github.com/palomachain/paloma/pull/1029
+* chore: increase minimum version of Pigeon by @byte-bandit in https://github.com/palomachain/paloma/pull/1030
+
+
+**Full Changelog**: https://github.com/palomachain/paloma/compare/v1.9.2...v1.10.0