register pgx in main cli, not internal

[daniel-garcia]

user@host migrate % go build
user@host migrate % ./migrate --database.driver hotload --database.dsn 'fsnotify://pgx/tmp/foo'
{"level":"info","msg":"error: could not get current_database: lstat /tmp/foo: no such file or directory","time":"2023-12-05T09:49:36-06:00"}

[coveralls]

Pull Request Test Coverage Report for Build 7103873237

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage increased (+0.1%) to 57.461%

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Files with Coverage Reduction	New Missed Lines	%
util.go	1	48.15%

Totals
Change from base Build 7101467101:	0.1%
Covered Lines:	3743
Relevant Lines:	6514

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💛 - Coveralls