Fix #1076: Add server.summary() function

[shwetd19]

Description

• Added summary() method to Server class to access server summary attribute
• Added hasSummary() helper method to check summary existence
• Updated ServerInterface with new method signatures

Related issue(s)
Fixes #1076

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Latest commit: 25e8fda

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[asyncapi-bot]

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

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

See analysis details on SonarQube Cloud

[smoya]

@shwetd19 please add a test into https://github.com/asyncapi/parser-js/blob/master/packages/parser/test/models/v3/server.spec.ts

Additionally, fix the title of the PR as CI mentions

Also, this PR doesn't fix the issue you mention in the description but #1076 instead. Please fix that as well 🙏