Add contextual schema lookup from query editor

[erikdarlingdata]

Summary

• Right-click a table, procedure, or function name in the query editor to view indexes, table definitions, or object definitions from the connected server
• Uses Microsoft.SqlServer.TransactSql.ScriptDom to parse SQL and resolve the object under the cursor
• Outputs proper CREATE TABLE/CREATE INDEX DDL with partition schemes, non-default index options, columnstore support, identity, computed columns, and PK constraints
• Right-click moves caret to click position for intuitive context menus
• Copy/Copy All/Select All context menu on schema result tabs

Addresses issue #1 (query editor half).

Test plan

• Right-click table name in editor → Show Indexes, Show Table Definition appear
• Right-click keyword (SELECT, FROM) → schema items hidden
• Right-click with no connection → schema items hidden
• Show Indexes produces correct CREATE INDEX DDL with usage stats
• Show Table Definition produces correct CREATE TABLE DDL
• Partitioned tables include ON partition_scheme(column)
• Non-default index options (fill factor, compression, lock settings) emitted
• Clustered columnstore indexes scripted correctly (no empty parens, no inherent options)
• PK constraint in CREATE TABLE includes WITH options when non-default
• Schema result tabs have Copy/Copy All/Select All context menu
• 11 unit tests pass for SqlObjectResolver

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