removed autopilot support for metadata in receiver and increased memo lengths

[sampocs]

Context and purpose of the change

Now that all our host zones are beyond IBC version 5, we can deprecate the autopilot format that accepts the metadata JSON in the receiver field. This PR also updates the max length for the receiver and memo fields (thanks to @PoolPirate, #1255)

Brief Changelog

• Removed support for autopilot metadata in the receiver
• Updated the max memo length to 4096 and the max receiver length to 100
• Enforced that the receiver is a valid address and matches the address in the memo
• Updated unit tests and integration tests

Integration Tests

 ✓ [INTEGRATION-BASIC-GAIA] host zones successfully registered
 ✓ [INTEGRATION-BASIC-GAIA] ibc transfer
 ✓ [INTEGRATION-BASIC-GAIA] liquid stake mint and transfer
 ✓ [INTEGRATION-BASIC-GAIA] delegation on GAIA
 ✓ [INTEGRATION-BASIC-GAIA] LSM liquid stake
 ✓ [INTEGRATION-BASIC-GAIA] LSM liquid stake with slash query
 ✓ [INTEGRATION-BASIC-GAIA] autopilot liquid stake
 ✓ [INTEGRATION-BASIC-GAIA] autopilot liquid stake and transfer
 ✓ [INTEGRATION-BASIC-GAIA] autopilot redeem stake
 ✓ [INTEGRATION-BASIC-GAIA] redemption and undelegation on GAIA
 ✓ [INTEGRATION-BASIC-GAIA] claim redeemed tokens
 ✓ [INTEGRATION-BASIC-GAIA] rewards are being reinvested, exchange rate updating
 ✓ [INTEGRATION-BASIC-GAIA] rewards are being distributed to stakers

[asalzmann]

LGTM