[CT-2353][Epic] Initial build out of new package dbt-semantic-interfaces for sharing of semantic layer interfaces

[QMalcolm]

As noted in dbt-labs/dbt-core#7456, for the integration of dbt-core and MetricFlow we are creating a third repo to put the shared semantic interface defintions. This is that repo. What that entails is protocol definitions for the semantic interfaces, default object implementations, default parsing / transformations / validations, and associated tests.

Tasks

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1. [CT-2346] Cut over current semantic objects and helpers from MetricFlow #1
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2. [CT-2357] Setup: Pre-Commit Hooks #2
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3. [CT-2363][Documentation] Add contributing guide #8
   documentation +1
   
4. Rename Identifiers to Entities and update object keys to new spec #9
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5. Update object keys of Measures to match new spec #10
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6. Update object keys of Dimensions to match new spec #11
   ready +1
   
7. Rename Models to SemanticModels and update object keys to new spec #12
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8. Update object keys of Metrics to match new spec #13
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9. Create protocol abstraction for Measures #14
   ready +1
   
10. Create protocol abstraction for Entities #15
    ready +1
    
11. Create protocol abstraction for Dimensions #16
    ready +1
    
12. Create protocol abstraction for SemanticModel #17
    ready +1
    
13. Create protocol abstraction for Metrics #18
    ready +1
    
14. Create SemanticManifest Protocol #19
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15. Update SemanticManifestValidator to expect a generic bound by the SemanticManifest Protocol #20
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16. Update SemanticManifestTransformer to expect a generic bound by the SemanticManifest Protocol #21
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Right Now Refactors

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1. [Spec Update] Rename measure_proxy metric type to simple #48
   Protocol Spec Change enhancement +2
2. [Spec Update] Rename is_primary to default_agg_time #49
   Protocol Spec Change enhancement +2
3. [Spec Update] Move default_agg_time to be in default struct within SemanticModel #50
   Protocol Spec Change enhancement +2
4. [Feature] Add a field to the Semantic Manifest protocol that attaches the dbt-semantic-interfaces version #30
   Protocol Spec Change enhancement +2

Public Alpha Refactors

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1. [Spec Update] Refactor dimension type_params to instead be separate CategoricalDimension and TimeDimension interfaces #51
   Protocol Spec Change enhancement +2
2. [Spec Update] Refactor metric type_params to instead be separate defined metric interfaces #53
   Protocol Spec Change enhancement +2
3. [Spec Update] Remove EXPR metric types #54
   Protocol Spec Change enhancement +2
4. [Spec Update] Redesign create_metric: default True and dict value to support create_metric_display_name #55
   Protocol Spec Change enhancement +2
5. [Spec Change] Update RATIO metric types to ingest metrics instead of measures #67
   Protocol Spec Change +1

Public Beta Refactors

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1. [Spec Update] Support inline metric definitions #56
   Protocol Spec Change enhancement +2
2. [Spec Update] Add a hidden property to metric and dimension properties #57
   Protocol Spec Change enhancement +2