Implement query to get block theme adoption based on new HTTP Archive custom metric

[felixarntz]

This query has the same purpose as the one implemented in #32, however it uses the HTTP Archive custom metric added in HTTPArchive/custom-metrics#62, which has been available in HTTP Archive datasets starting with March 2023.

This custom metric makes the query (which was extremely slow before as it had to parse entire response bodies) notably faster (in a comparison 3:33 minutes vs 35:49 minutes).

Query results

Row	client	total_wp_sites	with_block_theme	pct_total
1	desktop	4519655	31102	0.0068814986984626035
2	mobile	5829541	43403	0.00744535461711308

Based on April 2023 dataset

Comparison with old query

For reference, to assess the new numbers and performance of the query, the query from #32 was also run again for the April 2023 dataset. Here are the results:

Row	client	with_block_theme	total_wp_sites	pct_total	wp_gte_59
1	desktop	12669	4506581	0.002811222077224397	3810151
2	mobile	19992	5825503	0.0034318066611587015

This shows slightly lower percentages, likely because the query's approach of parsing the HTML from the response bodies is more error-prone.

[mukeshpanchal27]

Thanks @felixarntz, PR look good to me. I have updated table structure for old data.

Note: For old query the mobile data for wp_gte_59 is missing.