feat(go): switch to neotest-golang

[fredrikaverpil]

hey @adibhanna I've come across your repo a few times and just figured I'd contribute back 😄

What is this PR for?

This PR switches nvim-neotest/neotest-go for fredrikaverpil/neotest-golang.

Does this PR fix an existing issue?

Neotest-go comes with some problems which are mitigated in neotest-golang. A full description/background is available in the project README, but here are some highlights:

Neotest-go issues mitigated in neotest-golang

• Support for Testify framework: neotest-go#6
• Test Output in JSON, making it difficult to read: neotest-go#52
• "Run nearest" runs all tests: neotest-go#83
• Running test suite doesn't work: neotest-go#89
• Diagnostics for table tests on the line of failure: neotest-go#75
• Support for Nested Subtests: neotest-go#74
• DAP support: neotest-go#12

Features

• Supports all Neotest usage.
• Integrates with nvim-dap-go for debugging of tests using delve.
• Inline diagnostics.
• Works great with andythigpen/nvim-coverage for displaying coverage in the sign column (per-Go package, or per-test basis).
• Monorepo support (detect, run and debug tests in sub-projects).
• Supports table tests (relies on treesitter AST detection).
• Supports nested test functions.
• Supports testify suites.

Notes

• I'm the author of fredrikaverpil/neotest-golang.