[CAL][12] - Implement Sync() in DefaultAccessor

[ogtownsend]

• Migrates and implements Sync() in DefaultAccessor
• For more context, see NONEVM-1865

Stack:

1. [CAL][1] - Add initial CAL scaffolding to CCIPReader with legacy accessor #978
2. [CAL][2] - Implement Metadata() and GetContractAddress() #980
3. [CAL][3] - Implement GetChainFeeComponents #985
4. [CAL][4] - Implement MsgsBetweenSeqNums() function in accessor #987
5. [CAL][5] - implement LatestMsgSeqNum #988
6. [CAL][6] - move SourceChainConfig to chainaccessor types #989
7. [CAL][7] - implement GetExpectedNextSequenceNumber #990
8. [CAL][8] - Some minor cleanup and renaming #999
9. [CAL][9] - Implement CommitReportsGTETimestamp, GetTokenPriceUSD, and GetLatestPriceSeqNr #1000
10. [CAL][10] - Implement Nonces and GetChainFeePriceUpdate #1014
11. [CAL][11] - Implement ExecutedMessages for chain accessor #1017
12. ➡️ [CAL][12] - Implement Sync() in DefaultAccessor #1031

[github-actions]

Metric	ogt/cal-12-implement-Sync	main
Coverage	70.0%	69.9%

[ogtownsend]

cc @winder , I relocated this function here since USDC reader is still using it, but marked it deprecated. I looked into initializing the the CAL objects within this reader but it requires piping the contract writers down here from way above in the plugin factory so figured that's probably better done in its own PR.