revert changes to click decorators after click/mypy conflicts resolved

[ghukill]

While updating dependencies, PR #91 also reworked the order of click decorators to address a new, external conflict between click==8.1.3 and mypy==1.4.1.

This underlying conflict was discovered after the code change, and it's assumed a fix will be rolled out to click in the near future that will allow the previous decorator order while also aligning with mypy linting, as many others have encountered this as well.

Proposing to revert the click decorators to match other projects (with @click.command as the top-most decorator, with others following) once it's been determined that click and mypy are aligned.

Current:

@click.option(
    "-i",
    "--input-file",
    required=True,
    help="Filepath for harvested input records to transform",
)
@click.option(
    "-o",
    "--output-file",
    required=True,
    help="Filepath to write output TIMDEX JSON records to",
)
@click.option(
    "-s",
    "--source",
    required=True,
    type=click.Choice(list(SOURCES.keys()), case_sensitive=False),
    help="Source records were harvested from, must choose from list of options",
)
@click.option(
    "-v", "--verbose", is_flag=True, help="Pass to log at debug level instead of info"
)
@click.command()
def main(source, input_file, output_file, verbose):
...

Proposed reverted ordering, matching convention in other projects:

@click.command()
@click.option(
    "-i",
    "--input-file",
    required=True,
    help="Filepath for harvested input records to transform",
)
@click.option(
    "-o",
    "--output-file",
    required=True,
    help="Filepath to write output TIMDEX JSON records to",
)
@click.option(
    "-s",
    "--source",
    required=True,
    type=click.Choice(list(SOURCES.keys()), case_sensitive=False),
    help="Source records were harvested from, must choose from list of options",
)
@click.option(
    "-v", "--verbose", is_flag=True, help="Pass to log at debug level instead of info"
)
def main(source, input_file, output_file, verbose):
...

[ehanson8]

https://github.com/MITLibraries/alma-sapinvoices is also affected by this issue and the click version will need to be unpinned when the incompatibility is resolved