Move size_util functions to _timescaledb_functions schema

[svenklemm]

To increase schema security we do not want to mix our own internal objects with user objects. Since chunks are created in the _timescaledb_internal schema our internal functions should live in a different dedicated schema. This patch make the necessary adjustments for the following functions:

• relation_size(regclass)
• data_node_hypertable_info(name, name, name)
• data_node_chunk_info(name, name, name)
• hypertable_local_size(name, name)
• hypertable_remote_size(name, name)
• chunks_local_size(name, name)
• chunks_remote_size(name, name)
• range_value_to_pretty(bigint, regtype)
• get_approx_row_count(regclass)
• data_node_compressed_chunk_stats(name, name, name)
• compressed_chunk_local_stats(name, name)
• compressed_chunk_remote_stats(name, name)
• indexes_local_size(name, name)
• data_node_index_size(name, name, name)
• indexes_remote_size(name, name, name)

Disable-check: force-changelog-file

[codecov]

Codecov Report

Merging #5995 (86cc0a2) into main (3db6922) will decrease coverage by 7.55%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #5995      +/-   ##
==========================================
- Coverage   86.98%   79.43%   -7.55%     
==========================================
  Files         243      243              
  Lines       56006    49084    -6922     
  Branches    12403    12291     -112     
==========================================
- Hits        48716    38991    -9725     
+ Misses       4951     4270     -681     
- Partials     2339     5823    +3484     

Files Changed	Coverage Δ
tsl/src/dist_util.c	78.94% <ø> (-8.12%)	⬇️

... and 222 files with indirect coverage changes

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