feat: 🎸 get historical multisig proposals

[sansan]

Description

• adds method on MultiSig to get HistoricalMultiSigProposal(s) for that MultiSig

JIRA Link

https://polymesh.atlassian.net/browse/DA-129

Checklist

• [x] Updated the Readme.md (if required) ?

[sonarqubecloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[prashantasdeveloper]

:tada: This PR is included in version 24.3.0-alpha.5 :tada:

The release is available on:

• npm package (@alpha dist-tag)
• GitHub release

Your semantic-release bot :package::rocket:

[prashantasdeveloper]

:tada: This PR is included in version 24.3.0-beta.1 :tada:

The release is available on:

• npm package (@beta dist-tag)
• GitHub release

Your semantic-release bot :package::rocket:

[prashantasdeveloper]

:tada: This PR is included in version 24.3.0 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot :package::rocket: