Bump clang-format from 17.0.6 to 20.1.0

[eramongodb]

Raises the ClangFormat version used to format our codebase from 17.0.6 to 20.1.0 for better compatibility with recent versions of clangd (which embeds its own clang-format). See ClangFormat 20.1 docs for reference.

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The most significant change due to this upgrade is the formatting of list initializers, such as for compound literals, which does not seem to have a related configuration option (hence pre-ClangFormat 19 compatibility pains; it is not SpaceAfterCStyleCast or SpaceBeforeCpp11BracedList):

// Before
(type){ ... }

// After
(type) { ... }

This upgrade also seems to insert a space after some (paren) which it may be (mis-)interpreting as as C-style cast. These changes are left as-is due to relatively minor impact (especially compared to the compound literal changes mentioned above).

// Before
MONGOC_RPC_CONSUME (uint8_t, uint8_t, (uint8_t))

// After
MONGOC_RPC_CONSUME (uint8_t, uint8_t, (uint8_t) )

The last notable changes to mention are better handling of preprocessor macro definitions (e.g. applying existing rules, abbreviating to a single line, etc.). These changes are also left as-is due to relatively minor impact.

// Before
#define BSON_INITIALIZER \
   {                     \
      3, 5,              \
      {                  \
         5               \
      }                  \
   }

// After
#define BSON_INITIALIZER {3, 5, {5}}

There is also this one particular change which confuses me, but I do not think it is worth going out of our way to address/prevent .

// Before
typedef future_t *(func_with_opts_t) (func_ctx_t *ctx, bson_t *cmd);

// After (why?)
typedef future_t *(func_with_opts_t) (func_ctx_t * ctx, bson_t *cmd);

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The ClangFormat configuration file is regenerated (via --dump-config) to explicitly address all new/changed/removed options. Notable changes (relative to the old ClangFormat 17 config or relative to ClangFormat 20 defaults) include:

• AlwaysBreakAfterReturnType: All is renamed to BreakAfterReturnType: All
• AlwaysBreakTemplateDeclarations: Multiline renamed to BreakTemplateDeclarations: Multiline
• BinPackParameters is set to OnePerLine (equivalent to former value of false).
• IndentExportBlock is set to false for consistency with other Indent* options (default is true).
• KeepEmptyLinesAtTheStartOfBlocks: false renamed to KeepEmptyLines.AtStartOfBlock: false.
• KeepEmptyLinesAtEOF: false is renamed to KeepEmptyLines.AtEndOfFile: false.
• KeepEmptyLines.AtStartOfFile is set to false for consistency with other KeepEmptyLines options (default is true).
  • Setting this new option modified a few files which had empty newlines at the start of the file.
• MainIncludeChar is set to Any (default is Quote).

All other options are left as their default values.

[kevinAlbs]

LGTM and thank you.

[vector-of-bool]

LGTM!