Duckdb 2.0 - #9141

• Remove cast and pushdown optimizers as they're upstreamed in
  Push down type casts to file readers duckdb/duckdb#22788 and
  Push down scalar functions to file readers duckdb/duckdb#23528. Use upstreamed optimizer
  templated code.
• Link icu, tcph, tpcds, and httpfs extensions statically for commit builds.
• Do not run spatial tests for commit builds.
• Make Vortex's ExternalVectorBuffer hold the original parent in case Duckdb
  wants to reinitialize it with own data. This allows overriding a Vortex-owning
  buffer with a Duckdb buffer.
• Build duckdb's third party dependencies (i.e. fmtlib) as part of build.
• Expose string stats as truncated.
• Remove MultiFileReader patch as it's upstreamed in
  FinalizeScan() for MultiFileReader duckdb/duckdb#25036 and
  Update projection column by correct index in expression pushdown optimizers duckdb/duckdb#25431
• Support timestamp with timezone and nanosecond precision.
• Report all filters as pushed (remove Eq-not-pushed hack).
• Support 2.0 comparison/between/cast table filters.
• Support 2.0 table filters being expressions, e.g. IN on virtual column is a
  ExpressionRef(BoundFunction(_internal_optional: expr)) as opposed to 1.5's
  TableFilter::Optional.

Depends on #10155
Resolves: #8628