`E6` Creating a new index on an existing table

Description

Triggered when: A new index was created on an existing table without the CONCURRENTLY keyword.

Effect: This blocks all writes to the table while the index is being created.

Workaround: Run CREATE INDEX CONCURRENTLY instead of CREATE INDEX.

Detected by: eugene lint and eugene trace

Problematic migration

-- 1.sql
create table authors (
    id integer generated always as identity
        primary key,
    name text not null
);

-- 2.sql
set local lock_timeout = '2s';
create index
    authors_name_idx on authors (name);

Safer migration

-- 1.sql
create table authors (
    id integer generated always as identity
        primary key,
    name text not null
);

-- 2.sql
create index concurrently
    authors_name_idx on authors (name);

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