[CAL][4] - Implement MsgsBetweenSeqNums() function in accessor

[ogtownsend]

core ref: aad88a584c81e0be68f68927d5ab041fc65ca646

• Implement MsgsBetweenSeqNums() functions for Chain Access Layer in legacy accessor
• 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

[winder]

I wonder how much of this would be common across other accessors. Most of these checks could be done in the CCIPReader, may be worth moving them there in a followup PR.

[ogtownsend]

True, I guess this shouldn't really be chain-specific. I created NONEVM-1996

[winder]

Just a couple small changes. Mainly not putting SendRequestedEvent into the ccipocr3 package.

[github-actions]

Metric	ogt/cal-4-implement-msgs-between-seq-nums	ogt/cal-3-implement-get-chain-fee-components
Coverage	72.1%	71.6%