docs: specs for multisig

[rootulp]

Closes #736

Note: I played around with multisigs and wrote a script to show their basic functionality but that content seems more appropriate to live at https://docs.celestia.org/ than in the specs. Hence celestiaorg/docs#1351

[coderabbitai]

Walkthrough

The Celestia project has introduced native support for multisignature (multisig) accounts, allowing accounts to be controlled by multiple secret keys. This enhances security by adding a layer similar to two-factor authentication (2FA) but also increases the complexity of state transitions. The documentation has been updated to reflect this new feature, detailing the behavior, signature threshold, signers, and referencing the Cosmos SDK for implementation specifics.

Changes

File Path	Change Summary
specs/src/README.md, specs/src/SUMMARY.md	Added new "Multisig" section to documentation.
specs/src/specs/multisig.md	Detailed documentation for Multisig account support in Celestia, including behavior and signature requirements.

Assessment against linked issues

Objective	Addressed	Explanation
Document support for native multisigs (#736)	✅	The update includes detailed documentation for multisig account support, addressing the core objective of the issue.
Ensure multisig accounts increase security for users and validators	✅	The documentation indicates that multisig accounts provide enhanced security, akin to 2FA, which aligns with the objective for increased security.
Consider the complexity increase in state transition due to native multisigs	✅	The summary acknowledges the increased complexity in state transitions due to the support of multisig accounts.

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[staheri14]

LGTM! If possible, you might want to include a link to the script mentioned in the PR description within this doc.