fix: duplicate value of the name field in plan

[jaybxyz]

Summary of Bug

Currently, farming module validates duplicate value of the name field in plan. This allows an edge case where an outsider creates a private plan with the same value of the name field as public farming plan's name which is about to be passed during governance process.

Version

master branch

Steps to Reproduce

1. Send a governance proposal to create public farming plan with the name value of "testPlan"
2. Vote for the proposal to pass
3. When the proposal is about to be passed, create private farming plan with the same name
4. This results in public plan proposal to fail

Proposals

1. Remove validation for duplicate value of the name field in plan
2. Add gov keeper in farming module to keep in track of the existing proposals and validate the name value

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For Admin Use

• Not duplicate issue
• Appropriate labels applied
• Appropriate contributors tagged
• Contributor assigned/self-assigned

[jaybxyz]

Decision

As we've discussed through a video call, we decide to remove the duplicate validation logic and rename name field to title since name field somehow provides developers a sense of feeling that it can't be duplicate.

Tasks

• Rename name field to title for clarity and build new proto file to make sure it is generated (This brings more confusion since public plan proposal needs to have title field for governance proposal Content interface)
• Remove validation logic for duplicate value of the name in plan
• Update swagger version and generate swagger docs
• Update related documentation