feat(executor): add use_default and with to requests field

[hanxiao]

New features for executor-level YAML

• add use_default keyword under the requests field. If set, then missing request types and its drivers are auto-filled according to MRO.
• add with keyword under each request type. If set, then all drivers under that request type will have the share that `kwargs.
• when with is set under request type, then drivers keyword must be used to contain the list of drivers.

For example,

Before	After
!ImageNormalizer requests: on: ControlRequest: - !ControlReqDriver {} [IndexRequest, SearchRequest]: - !FilterQL with: lookups: mime_type: image/jpeg traversal_paths: ['c'] - !URI2Blob with: traversal_paths: ['c'] - !CraftDriver with: traversal_paths: ['c']	!ImageNormalizer requests: use_default: true # for the request_type not mentioned in `on`, fill in default requests by following MRO tree on: [IndexRequest, SearchRequest]: with: # common kwargs that will be shared by all drivers traversal_paths: ['c'] drivers: - !FilterQL {} - !URI2Blob {} - !CraftDriver {}

[codecov]

Codecov Report

Merging #1959 (4dafc09) into master (d153381) will decrease coverage by 27.95%.
The diff coverage is 88.88%.

@@             Coverage Diff             @@
##           master    #1959       +/-   ##
===========================================
- Coverage   86.52%   58.57%   -27.96%     
===========================================
  Files         148      148               
  Lines        7093     7094        +1     
===========================================
- Hits         6137     4155     -1982     
- Misses        956     2939     +1983     

Impacted Files	Coverage Δ
jina/drivers/convertdriver.py	72.72% <ø> (-21.22%)	⬇️
jina/drivers/encode.py	33.33% <ø> (-60.87%)	⬇️
jina/drivers/evaluate.py	56.89% <ø> (-41.38%)	⬇️
jina/drivers/querylang/select.py	72.41% <ø> (-17.25%)	⬇️
jina/executors/rankers/__init__.py	58.97% <ø> (-33.34%)	⬇️
jina/parsers/check.py	85.71% <ø> (ø)
jina/parsers/client.py	100.00% <ø> (ø)
jina/parsers/export_api.py	85.71% <ø> (ø)
jina/parsers/flow.py	100.00% <ø> (ø)
jina/parsers/helloworld.py	95.00% <ø> (-5.00%)	⬇️
... and 112 more

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[github-actions]

Latency summary

Current PR yields:

• 😶 index QPS at 1197, delta to last 3 avg.: +1%
• 🐢🐢 query QPS at 17, delta to last 3 avg.: -12%

Breakdown

Version	Index QPS	Query QPS
current	1197	17
1.0.0	1178	19

Backed by latency-tracking. Further commits will update this comment.